Livestock Science最新文献

{"title":"Effects of dietary protein digestion kinetics on sow body condition loss and litter performance during lactation: A meta-analysis","authors":"Hao Ye ,&nbsp;Pieter Langendijk ,&nbsp;Neil W. Jaworski ,&nbsp;Bas Kemp ,&nbsp;Junjun Wang ,&nbsp;Greg Page ,&nbsp;Nicoline M. Soede","doi":"10.1016/j.livsci.2025.105654","DOIUrl":"10.1016/j.livsci.2025.105654","url":null,"abstract":"<div><div>Over the last decades, litter size has increased considerably in modern hybrid sows. This raises concerns over body tissue mobilisation during lactation. Recent evidence suggests that protein tissue mobilization is specifically associated with reduced milk production, affecting litter weight gain, and with impaired ovarian function, affecting sow subsequent reproductive performance. Therefore, efficient utilization of dietary protein for milk production is critical during lactation. A meta-analysis was performed to investigate the role of dietary protein digestion kinetics in lactating sow weight loss, litter weight gain and nitrogen loss to the environment. Data were obtained from 17 peer reviewed publications between 1993 and 2019, including 63 different groups of sows fed with 59 different lactation diets. These publications were selected for their research focus on dietary crude protein concentration in relation to sow body weight loss and litter weight gain during lactation. Percentages of slow, fast and resistant protein in the total protein of the diets were estimated based on previously established <em>in vitro</em> protein degradation characteristics of the used ingredients. Results showed that higher total crude protein reduced sow weight losses and estimated body protein losses during lactation (β = -0.07 kg · (g/kg) ⁻¹, <em>P</em> = 0.01; β = -0.02 kg · (g/kg) ⁻¹, <em>P</em> &lt; 0.01, respectively). An increase in the percentage of slow protein in total protein was associated with decreases of sow total weight loss (β = -1.85 kg/%, <em>P</em> &lt; 0.01), estimated body protein loss (β = -0.33 kg/%, <em>P</em> &lt; 0.01), while the percentage of fast protein in total protein was estimated to increase sow weight loss and estimated body protein loss during lactation (β = 0.46 kg/%, <em>P</em> = 0.03; β = 0.09 kg/%, <em>P</em> = 0.01, respectively). The percentage of resistant protein in total protein did not affect sow body losses but showed a negative relationship with litter weight gain during lactation (β = -0.80 kg/%, <em>P</em> &lt; 0.01). Sow nitrogen loss to the environment during lactation was increased with a higher crude protein in the diet (β = 13.9 g· (g/kg) ⁻¹, <em>P</em> &lt; 0.01), but not affected by protein digestion kinetics. This meta-analysis suggests that a high percentage of slow protein reduces sow body protein mobilization during lactation, probably due to a more sustained and prolonged amino acid delivery to the circulation than with fast protein, and therefore improves utilization of dietary amino acids rather than use them as energy source.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"293 ","pages":"Article 105654"},"PeriodicalIF":1.8,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143394382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Grazing lambs on a low-input, multispecies pasture for an extended period has no detrimental effect on meat nutritional or sensory quality","authors":"K.E. Kliem ,&nbsp;D.J. Humphries ,&nbsp;S. Lignou ,&nbsp;D.T. Juniper","doi":"10.1016/j.livsci.2024.105629","DOIUrl":"10.1016/j.livsci.2024.105629","url":null,"abstract":"<div><div>There is an increasing interest in low-input, multispecies swards as a sustainable forage for ruminant production, but the impact of grazing these over extended periods of time on meat nutritional quality (fatty acid (<strong>FA</strong>) profile, trace minerals and oxidisability risk) and sensory properties is unclear. Thirty lambs were grazed for 133 days on either a perennial ryegrass (<strong>PRG</strong>) or botanically diverse (containing twelve plant species, <strong>BD</strong>), pasture. The effects on the FA composition of <em>musculus longissimus thoracis</em> (lean and subcutaneous fat), zinc and iron content (lean), glutathione perioxidase (<strong>GSH-Px</strong>) activity (lean and plasma) and thiobarbituric acid reactive substances (<strong>TBARS</strong>) content (lean) were determined, and cooked meat was assessed for sensory properties using a trained sensory panel. BD lambs were lighter (<em>P</em> = 0.014) and had a lower weekly live weight gain (<em>P</em> = 0.017) than PRG, which was probably due to the nutritional quality of the pasture. BD pasture increased (<em>P &lt;</em> 0.05) 18:2 n-6 content in lean and subcutaneous fat, and there was no effect (<em>P</em> &gt; 0.05) on other polyunsaturated FA (<strong>PUFA</strong>), GSH-Px activity or TBARS content. BD pasture increased (<em>P</em> = 0.038) lean tissue zinc content compared with PRG but did not affect iron (<em>P</em> &gt; 0.05). Pasture type had no impact (<em>P</em> &gt; 0.05) on meat aroma and flavour sensory properties. It was concluded that grazing BD for an extended period did not negatively affect the nutritional and eating quality of lamb meat compared with PRG, and as such is suitable for finishing lambs. In order to benefit economically from including a BD pasture in a lamb finishing system, producers may need to consider an earlier slaughter target weight, depending on live weight gain.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105629"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Genetic parameters for the occurrence of bovine viral diarrhea virus in Holstein cattle in Brazil","authors":"Simone Soares da Silva ,&nbsp;Denyus Augusto de Oliveira Padilha ,&nbsp;Altair Antônio Valloto ,&nbsp;Rodrigo de Almeida Teixeira ,&nbsp;Laila Talarico Dias","doi":"10.1016/j.livsci.2025.105645","DOIUrl":"10.1016/j.livsci.2025.105645","url":null,"abstract":"<div><div>Bovine viral diarrhea virus (BVDV) is a significant infectious disease that affects livestock worldwide and is primarily associated with reproductive problems. Due to the absence of studies that have determined genetic parameters for the disease, the aim of this study was to estimate the heritability coefficient for the occurrence of BVDV and the correlation between estimated breeding values (EBVs) for BVDV and EBVs for productive, reproductive, and health traits in Holstein dairy cattle in Brazil. 18,464 BVDV phenotypes from animals tested between September 2015 and June 2021 across 8 commercial dairy farms were provided by the Holstein Cattle Breeders Association of Parana State, Brazil. Animals with an ELISA antigen test equal to or greater than 0.3 were classified as BVDV positive, and the prevalence of the disease was determined. For the genetic analyses, 6,202 phenotypes were used. Heritability coefficient and EBVs were estimated using a threshold animal model with GIBBSF90+ software, considering as fixed the effect of the class of animal's age (calves, from 1 to 183 days old; young animals, from 184 to 365 days old; heifers, from 366 to 599 days old; primiparous cows, from 600 to 1,000 days old; and multiparous cows, from 1,001 to 3,650 days old), as random the effect of the contemporary group (herd-year-season of the test), direct additive genetic, and residual. Pearson correlations were performed among the EBVs of bulls estimated for BVDV and the EBVs for productive, reproductive and health traits obtained from the Council on Dairy Cattle Breeding database. The overall prevalence of BVDV infection was 2.56 %. The estimated heritability was 0.18±0.09, suggesting some genetic variability. Most of the correlation estimates among EBVs were negative, non-significant, and close to zero. However, the estimates among BVDV and some traits were low-magnitude, negative, and significant (P&lt;0.05) as Productive Life (-0.13), Daughter Pregnancy Rate (-0.07), Cow Conception Rate (-0.11), Cow Livability (-0.15), Displaced Abomasum (-0.11), Ketosis (-0.06), Mastitis (-0.09), and Feed Saved (-0.07). Therefore, genetic selection has limited potential in addressing the occurrence of BVDV. Nevertheless, it is recognized that the combination of disease eradication protocols with better-organized recording of phenotypes in herds could enable farms to improve herd health and animal welfare.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105645"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of climate change on the productivity and adaptation of Ethiopia's Bonga and Menz sheep breeds","authors":"Zeleke Tesema ,&nbsp;Tesfaye Getachew ,&nbsp;Berhanu Belay ,&nbsp;Yosef Amha ,&nbsp;Mourad Rekik ,&nbsp;Barbara Rischkowsky ,&nbsp;Shanbel Besufkad ,&nbsp;Zelalem Abate ,&nbsp;Tamrat Bekele ,&nbsp;Teferi Demissie ,&nbsp;Dawit Solomon ,&nbsp;Aynalem Haile","doi":"10.1016/j.livsci.2024.105633","DOIUrl":"10.1016/j.livsci.2024.105633","url":null,"abstract":"<div><div>This study aimed to derive novel phenotypes of sheep resilience and response to climate change, to estimate genetic parameters for novel phenotypes, and to evaluate the genetic correlation of resilience indicator traits with economically important traits. This study used the 14 years (2009–2022) of productive, reproductive, pedigree, and climate data to derive resilience and stability phenotypes using a random regression model fitting to the reaction norm function and genetic parameter estimates were estimated from a linear mixed model. The changes in productive and reproductive performance of both sheep breeds in response to environmental descriptors ((temperature-humidity index (THI) and rainfall (RF)) were found to be minimal and not significantly (<em>P</em> &gt; 0.05) different from zero, suggesting that most of these traits showed stable performance independent of THI and RF. The direct heritability (h²) estimate (0.101–0.163) for the resilience of Bonga sheep in terms of weight gain, Kleiber ratio (KR), total lamb birth weight, and annual reproduction rate (ARR) indicated the presence of substantial genetic variance. Nevertheless, the h² for resilience and stability phenotypes of Bonga sheep in terms of other reproductive traits were found to be low (0.0001 – 0.098). The highest h² for resilience of Menz sheep was observed for total lamb weaning weight (0.416), followed by body weight (0.145), KR (0.114), and ARR (0.110). The genetic progress of THI-based resilience was favorable for most of the traits of Bonga sheep. The genetic trend for rainfall-based resilience for most productive and reproductive traits of Menz sheep was genetically decreasing slightly. In conclusion, the influence of heat stress and rainfall on the performance of both sheep breeds is minimal. But different lambs and ewes react differently to a changing climate, and there is some level of genetic contribution to the variability of reaction for some traits. This suggests the possibility of improving the resilience of sheep to weather variation through within-breed selection to sustain these sheep breeds' optimal production and reproduction performances in changing climate conditions, although the influence is minimal. Besides, the contribution of the environment to phenotypic variation of resilience and stability phenotypes was high for most traits, which calls for management intervention to enhance sheep resilience to climate change.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105633"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nursing frequency, duration and teat location affect immunoglobulin concentrations in piglets","authors":"Abigail K. Jenkins ,&nbsp;Courtney M. Clemons,&nbsp;William L. Flowers","doi":"10.1016/j.livsci.2024.105631","DOIUrl":"10.1016/j.livsci.2024.105631","url":null,"abstract":"<div><div>Two experiments were conducted. The objective of the first experiment was to determine whether the anatomical location of teats affected colostrum quality. Colostrum composition from the first two, middle three, and last three pairs of teats from 18 sows was determined 1 to 2 h before and 24 h after the birth of the first piglet. Protein, IgG and IgA were significantly reduced (<em>P</em> ≤ 0.05), while lactose and fat tended to be reduced (0.05 ≤ <em>P</em> ≤ 0.1) in posterior teats. Immunoglobulin concentrations decreased (<em>P</em> ≤ 0.05) significantly over time regardless of anatomical location. The objective of the second experiment was to determine how much of the variation in piglet immunoglobulin levels was associated with suckling behaviors when considered in conjunction with sow and piglet birth characteristics. Piglet birth variables and suckling behaviors were recorded for 587 piglets from 43 litters beginning with the birth of the first piglet until 4 h after the sow expelled her placenta. Piglet immunocrits were measured 30 ± 3 h after the onset of farrowing. Ten variables from the multiple regression analysis were identified as sources of variation (<em>P</em> ≤ 0.15) for piglet immunocrits (model R² = 0.6486) with pigs born alive in the current litter (partial R² = 0.1596; <em>P</em> = 0.0008) and the anatomical location of the pair of teats suckled most (partial R²=0.1410; <em>P</em> = 0.0001) being the most important. Piglets that suckled the last three pairs of teats had reduced immunocrits (<em>P</em> = 0.01; 0.073 ± 0.003) compared with those that suckled the anterior (0.081 ± 0.002) and middle (0.083 ± 0.003) pairs. Piglets from litters with &gt;16 liveborn had reduced (<em>P</em> ≤ 0.05) immunocrits (0.071 ± 0.002) compared with those from smaller litters (0.079 ± 0.001). The total number of teat pairs suckled (partial R²=0.0615; <em>P</em> = 0.0489), total time observed suckling (partial R²=0.0389; <em>P</em> = 0.0498), average pigs born alive from previous parities (partial R²=0.0889; <em>P</em> = 0.0005), birthweight (partial R² = 0.0538; <em>P</em> = 0.0497), and time between a piglet's birth and the onset of farrowing (partial R² = 0.0776; <em>P</em> = 0.0007) were other variables with significant associations with immunocrits. This study demonstrated that suckling behaviors are a significant source of variation for consumption of immunoglobulins and piglets that suckle posterior teats most frequently post-farrowing are at risk for low consumption because of the reduced amount of colostral immunoglobulins produced in those mammary glands.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105631"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mode of synergistic action of hydrolyzable tannins and probiotic microorganisms on the growth performance, immunology, ileal histomorphology and microbiology in broiler chickens","authors":"Mohammad Hassan Akhoundzadeh ,&nbsp;Amir Hossein Mahdavi ,&nbsp;Mohammad Sedghi ,&nbsp;Mehdi Shahsavan","doi":"10.1016/j.livsci.2025.105648","DOIUrl":"10.1016/j.livsci.2025.105648","url":null,"abstract":"<div><div>The current study was conducted to evaluate the synergistic effects of three concentrations of either hydrolyzable tannin (HT; g/kg) or probiotic microorganisms (PM; g/kg) on the intestinal microbiota, histomorphology, immunological responses, and growth performance of broiler chickens. A total of 1404 one-day-old female broiler chickens were randomly assigned to nine experimental treatments with six replicates and each pen as a replicate contained 26 chickens. Treatments consisted of a 3 × 3 factorial arrangement, consisting of 0, 0.75, and 1.5 g HT/kg of diet (0 HT, 0.75 HT, and 1.5 HT) and 0, 0.1, and 0.2 g PM/kg of diet (0 PM, 0.1 PM, and 0.2 PM). The results showed that dietary inclusion of 0.75 HT + 0.1 PM resulted in the greatest average daily weight gain (ADWG) with improved feed conversion ratio (FCR), increased immunoglobulin G, immunoglobulin M, and total antibody titers against sheep red blood cell, increased ileal villi length (VL), and the heaviest relative weight of bursa of Fabricius (<em>P</em> &lt; 0.05). Broiler chickens fed only with 0.75 HT benefited from the largest ADWG, smallest FCR, heterophils to lymphocytes ratio (H:L), ileal <em>E. coli</em> count, and greatest ileal villi length to crypt depth ratio (VL:CD), and immunoglobulin G, immunoglobulin M, and total antibody titers against sheep red blood cell (<em>P</em> &lt; 0.05). Nevertheless, feeding 1.5 HT led to a decrease in ADWG, humoral immune response, liver relative weight, VL:CD, and an increase in FCR, the numbers of goblet cells, and H:L (<em>P</em> &lt; 0.05). Similarly, dietary administrations of 0.2 PM caused the greatest numbers of monocytes, intestinal <em>Lactobacillus</em>, lamina propria lymphoid follicles, goblet cells, and the lowest H:L as well as pH of the ileal content, and <em>E. coli</em> enumeration (<em>P</em> &lt; 0.05). In general, the present findings would indicate that although dietary inclusion of 0.2 PM improved the growth performance and either microbial or histological indices at the ileum of broiler chickens, feeding 0.75 HT + 0.1 PM, without an adverse effect on gut microbiota, manifested the best synergistic effects on the growth performance of broiler chickens via improvement of humoral immunity, relative weights of lymphoid organs, and the ileal absorptive area.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105648"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of a supplement of potassium formate and/or probiotic to the feed on the protection of piglets gastrointestinal tract against the negative effects of pathogenic bacteria","authors":"Marek Pieszka ,&nbsp;Kinga Szczepanik ,&nbsp;Sylwia Orczewska-Dudek ,&nbsp;Marian Kamyczek ,&nbsp;Bogdan Śliwiński ,&nbsp;Łukasz Gala ,&nbsp;Magdalena Pieszka","doi":"10.1016/j.livsci.2024.105637","DOIUrl":"10.1016/j.livsci.2024.105637","url":null,"abstract":"<div><div>The study aimed to evaluate the effects of potassium formate and/or probiotics in feed on intestinal microflora stability, gastrointestinal tissue histomorphometry, enzyme activity, and the growth of piglets. Animals in each group were kept in pens consisting of 6 litters per group. Piglets received: control (no supplement), D1 (potassium formate), and D2 (potassium formate and probiotic). Feed additives had a positive effect on piglet rearing traits, including final body weight (D2: 22.75 kg vs. D1: 20.26 kg and control: 18.96 kg). Histomorphometric analysis revealed wider ileum intestine crypts in the D1 group compared to the other groups (P = 0.048). The additives reduced acetic acid levels in D1 and D2 (48.04 and 42.02 mmol/kg vs. 63.10 mmol/kg) and increased propionic acid (23.80 mmol/kg in control to 30.27 and 33.18 mmol/kg in D1 and D2). Significant increases were also noted in butyric (9.95 vs. 16.88 and 18.98 mmol/kg, P = 0.014) and isobutyric acid levels (0.45 vs. 1.14 and 2.00 mmol/kg, P = 0.024). Jejunum saccharase and aminopeptidase N activity were significantly higher in the experimental groups, while HPT and CRP protein levels were higher in the control (19.77 vs. 16.37 and 14.22 ng/ml; 4.99 vs. 2.91 and 2.67 ng/ml, respectively). IgG content was also greater in the control group (1.945 mg/ml) compared to D1 (1.381 mg/ml) and D2 (1.432 mg/ml). The simultaneous use of potassium formate or potassium formate with a probiotic shows a great positive influence on status of health in the pre-weaning period of piglets.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105637"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The teat number in rabbits: The possibility and benefits of selection for this trait","authors":"Zsolt Szendrő","doi":"10.1016/j.livsci.2024.105635","DOIUrl":"10.1016/j.livsci.2024.105635","url":null,"abstract":"<div><div>The purpose of the review is to present the distribution of teat number in rabbits, its relationship with some reproductive traits, and the possibility and limitations of selection for increasing teat number. In many mammal species, it has been observed that the number of offspring born is typically half as many or at most equal to the number of teats (\"one-half rule\"). While this rule holds true for European wild rabbits, it is no longer applicable for domesticated rabbits. Teat numbers most commonly range from 8 to 10, while litter size of hybrid rabbits typically fall between 10 and 12. A weak correlation was found between teat number and litter size at birth, but a closer relationship was observed between teat number and the survival of suckling kits or litter size at 3 weeks, especially in litters larger than 10. The high heritability of teat number was confirmed by the distribution of the teat number of the offspring from parents with 8 or 10 teats. Selection experiments have shown that it is possible to increase the average number of teats and the proportion of rabbits with 10 teats, although rabbits with 11 or 12 teats are rarely born. When selecting maternal lines, the number of teats should be considered to increase litter size. In the short term, selecting does with 10 teats is beneficial as it increases the chances of survival for kits during nursing, as they have more opportunities to access milk. In the long-term, this selective breeding strategy can lead to improved survival rates and overall reproductive success in rabbit populations.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105635"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fast across all distances: Genetic parameters and selection for racing time in Quarter Horses using a random regression model","authors":"Thiago G.B. Franco ,&nbsp;Annaiza B. Bignardi ,&nbsp;Ricardo A.S. Faria ,&nbsp;Antônio R. Silva ,&nbsp;Josineudson A.II V. Silva ,&nbsp;Mário L. Santana","doi":"10.1016/j.livsci.2025.105653","DOIUrl":"10.1016/j.livsci.2025.105653","url":null,"abstract":"<div><div>The Quarter Horse, renowned for its exceptional speed and versatility, is one of the most prominent breeds in short-distance racing. Despite this, there is a lack of studies on the performance of these animals across different distances, particularly using an approach that accounts for the longitudinal nature of racing performance. Our objectives in this study were to apply a random regression model (RRM) to estimate genetic parameters for racing time (RT) at different distances in Brazilian Quarter Horses and to examine the genetic trends in performance over recent years. A total of 21,173 records from 4,482 horses that competed in races of varying distances were used. The heritability and repeatability estimates ranged from 0.05 ± 0.02 to 0.22 ± 0.03 and from 0.17 ± 0.02 to 0.48 ± 0.04 for shorter to longer distances, respectively. The genetic correlations for RT between different race distances were very high and positive, with the lowest correlation observed between the 275 m and 402 m distances (0.84 ± 0.12). The RRM effectively identified animals with stable and variable genetic merit across distances. Genetic trends for RT were favorable across races of all distances. Selecting for RT in longer distances may enhance speed across all distances. This longitudinal evaluation proved effective for analyzing performance, revealing important genetic progress in the Brazilian Quarter Horse population, particularly in 402 m races.</div></div>","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"293 ","pages":"Article 105653"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143342765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Implications of Commercial Cross-Fostering in Large Litters when Low Body Weight of Piglets is the Main Criterion”","authors":"Dubravko Škorput ,&nbsp;Zoran Luković ,&nbsp;Danijel Karolyi ,&nbsp;Dejan Škorjanc ,&nbsp;Ana Kaić ,&nbsp;Janko Skok ,&nbsp;Maja Prevolnik Povše","doi":"10.1016/j.livsci.2024.105630","DOIUrl":"10.1016/j.livsci.2024.105630","url":null,"abstract":"","PeriodicalId":18152,"journal":{"name":"Livestock Science","volume":"292 ","pages":"Article 105630"},"PeriodicalIF":1.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143095441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}