South African Journal of Animal Science最新文献_第10页

Effect of lupin flake supplementation on rumen fermentation and meat composition of Hanwoo steers 添加罗苹片对汉宇阉牛瘤胃发酵及肉成分的影响

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i5.01

K. Um, J.S. Shin, B. Park

{"title":"Effect of lupin flake supplementation on rumen fermentation and meat composition of Hanwoo steers","authors":"K. Um, J.S. Shin, B. Park","doi":"10.4314/sajas.v52i5.01","DOIUrl":"https://doi.org/10.4314/sajas.v52i5.01","url":null,"abstract":"Lupin is considered a potentially rich source of energy and protein for various livestock breeds. However, there are no studies on rumen fermentation and meat composition of Hanwoo (Korean native) steers following supplementation with lupin flakes. In vitro and in situ experiments of lupin flake-supplemented feed were conducted using three Hanwoo cows with rumen fistulae for four weeks. The feeding experiment was conducted using 40 early-fattening Hanwoo steers randomly divided into four groups for 14 months from 16 to 30 months of age, viz., T1, T2, T3, and T4, with feed containing 0%, 3%, 6%, and 9% lupin flakes, respectively. The pH of the ruminal fluid in vitro at 24 and 48 h was higher in T3 and T4 than T1. The rumen levels of acetate, propionate, butyrate, and total volatile fatty acids after 48 h of incubation were lower in the lupin-supplemented groups than in T1. The ruminal pH in situ after 9 and 12 h was higher in T3 than in T1. The strip loin in Hanwoo steers was lighter in T3 than in the other treatment groups. The levels of carnosine, creatinine, adenosine triphosphate, and adenosine monophosphate in the strip loin were higher in T3 and T4 than in T1. The levels of oleic acid and unsaturated fatty acids and the n-6/n-3 ratio tended to be higher in T3 than in T1. Supplementation of livestock feed with 6% lupin flakes had positive effects on ruminal pH and meat lightness, carnosine, creatinine, adenosine triphosphate, and adenosine monophosphate levels in Hanwoo beef.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81027791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The relationship between the internal and external morphological parameters of honeybee queens (Hymenoptera: Apidae) and the determination of morphological variation 膜翅目:蜂科蜂王内外形态参数的关系及形态变异的测定

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v53i1.03

G. Ö. Özbakir

{"title":"The relationship between the internal and external morphological parameters of honeybee queens (Hymenoptera: Apidae) and the determination of morphological variation","authors":"G. Ö. Özbakir","doi":"10.4314/sajas.v53i1.03","DOIUrl":"https://doi.org/10.4314/sajas.v53i1.03","url":null,"abstract":"This study was carried out to determine the crucial external and internal morphological characteristics for evaluating queens in three rearing periods (May, June, and July). Data of 65 queens reared from the local honeybees of the Sanliurfa (Apis mellifera L.) and Anatolian (Apis mellifera anatoliaca) honeybee colonies were used. Discriminant and principal component analyses (PCA) were done for thirty-one external and internal morphological characteristics of queens. The highest weight of the queen at emergence was determined in May for the Sanliurfa queens and in June for the Anatolian queens. The averages in ovary weight and spermathecae diameter of queens were found to be non-significant according to groups and periods. The number of ovarioles of the queens was different according to rearing period. Using the left basitarsus width variable, the Sanliurfa and Anatolian queens were classified correctly to their pre-assigned groups using discriminant analysis (73.8%). According to the result of PCA applied to all variables of queens, nine components explained 81.68% of the total variation. The seven variables in the first principal component were the left basitarsus length, the right hindleg length, the left hindleg length, the right basitarsus length, the left tibial length, the right tibial length, and the left basitarsus width. The forewing and the hindwing characteristics were included in the second principal component, and the number of ovarioles was included in the third principal component. The study shows that genotypes can be discriminated using the hindleg variables, in particular, as well as the internal and external morphological parameters of the queens.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74013583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance and meat quality of broiler chickens fed diets containing hydroethanolic extract of guavira seed or peel 番石榴籽或果皮氢乙醇提取物对肉鸡生产性能和肉品质的影响

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i5.14

P. O. Nesello, C. Eyng, R. Nunes, E. Argandoña, C. Correia, J. Broch, N. Rohloff Junior, V. Savaris, E. C. dos Santos

{"title":"Performance and meat quality of broiler chickens fed diets containing hydroethanolic extract of guavira seed or peel","authors":"P. O. Nesello, C. Eyng, R. Nunes, E. Argandoña, C. Correia, J. Broch, N. Rohloff Junior, V. Savaris, E. C. dos Santos","doi":"10.4314/sajas.v52i5.14","DOIUrl":"https://doi.org/10.4314/sajas.v52i5.14","url":null,"abstract":"The dietary inclusion of hydroethanolic extract of guavira seed or peel was evaluated on broiler performance, intestinal morphometry, carcass yield, and meat quality. A total of 1,680 male chicks, one day old, were distributed in a 2×5+2 factorial design (hydroethanolic extract of guavira seed (HEGS) or hydroethanolic extract of guavira peel (HEGP); 100; 200; 300; 400 and 500 mg/kg of inclusion and a positive control (PC) with antibiotics and negative control (NC) without growth promoter), with seven replicates and 20 birds each. A better feed conversion ratio (FCR) was observed from days 1–7 and days 1–21 on the PC diet than on the NC diet. FCR from 1–7d of broilers on PC was better than those on HEGS or HEGP, and this better FCR was maintained until 21 d for the HEGS treatment. The HEGP diet showed lower average feed intake and better FCR for the total period compared to NC diets. Higher carcass yield and a higher L15 value for breast meat was observed in the HEGP group compared to HEGS. Broilers fed the PC diet showed a higher a* value 15 min and 24 h postmortem, higher water retention capacity in breast meat compared to birds fed HEGS, and a higher value of a* 24 h postmortem than those receiving NC. The inclusion of 100 to 500 mg/kg of HEGP or HEGS did not improve performance, intestinal morphometry, and carcass characteristics when compared to the performance-enhancing antibiotic. However, the HEGP diet provided better performance of broilers than the non-use of growth promoter additives in the diet.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90121595","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of far infrared ray illumination on the performance, blood biochemistry, and faecal microflora of laying hens at different production stages 远红外线照射对不同生产阶段蛋鸡生产性能、血液生化及粪便微生物群的影响

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v53i1.08

C. Lim, H. Kim, A. You, K. N. Heo, H. Choo

{"title":"Effects of far infrared ray illumination on the performance, blood biochemistry, and faecal microflora of laying hens at different production stages","authors":"C. Lim, H. Kim, A. You, K. N. Heo, H. Choo","doi":"10.4314/sajas.v53i1.08","DOIUrl":"https://doi.org/10.4314/sajas.v53i1.08","url":null,"abstract":"This study investigated the effect of far-infrared ray (FIR) illumination on performance, blood biochemistry, and faecal microflora of laying hens at different production stages. A total of 360 Hy-line brown laying hens were randomly allocated in a 2 × 2 factorial arrangement with six replicates. Hens were distributed in two production stages (30–39 and 45–54 weeks-old). Each group was exposed to two light types (light emitting diode; LED and LED+FIR) in separate rooms. The LED treatment illuminated a wavelength of 650 ± 10 nm (0.65 ± 0.01 μm), while LED+FIR treatment emitted 15 ± 10 μm with an LED wavelength. The results showed an interaction between egg production stages and light types on the serum triglyceride concentration. The hens exposed to the LED+FIR and LED treatments showed similar egg production, feed intake, egg weight, feed conversion ratio (FCR), as well as albumen height, haugh unit, and shell thickness of eggs. LED+FIR substantially decreased the concentration of serum cholesterol (CHOL), HDL cholesterol (HDLC), and triglyceride (TG) compared to LED lighting. LED+FIR substantially reduced the number of total microbes, Escherichia coli, and Salmonella in faeces compared to birds exposed to LED light. These findings suggest that LED+FIR lights may improve hen health and the hen house environment.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90284823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Addition of equine chorionic gonadotropin in controlled internal drug-release-based synchronization improves reproductive performance of Nili-Ravi buffalo in the sub-tropics 马绒毛膜促性腺激素在控制内药物释放同步的基础上，提高了nli - ravi水牛在亚热带地区的生殖性能

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i4.05

M. Naveed, M. Hassan, A. Husnain, U. Riaz, M. Ahmad, M. Yousuf, N. Ahmad

{"title":"Addition of equine chorionic gonadotropin in controlled internal drug-release-based synchronization improves reproductive performance of Nili-Ravi buffalo in the sub-tropics","authors":"M. Naveed, M. Hassan, A. Husnain, U. Riaz, M. Ahmad, M. Yousuf, N. Ahmad","doi":"10.4314/sajas.v52i4.05","DOIUrl":"https://doi.org/10.4314/sajas.v52i4.05","url":null,"abstract":"This study evaluated the effect of equine chorionic gonadotropin (eCG) and factors such as body condition score (BCS), cyclicity, and breeding season in a controlled internal drug release (CIDR)-based oestrus synchronization protocol on ovarian follicle dynamics, oestrus expression, ovulation rate, and pregnancy per artificial insemination (AI) (P/AI) in Nili-Ravi buffalo. Adult buffaloes (n = 88), 6.69 ± 1.17 years, parity 3.36 ± 0.97, and BCS 2.76 ± 0.45, were randomly administered eCG or saline, concurrent with prostaglandin F2α (PGF2α) treatment on Day 6 in a CIDR synchronization protocol during the breeding season and low breeding season. Follicular dynamics and oestrus expression were recorded from eCG administration until ovulation. Fixed-time artificial insemination (FTAI) was performed at 48- and 60-hour intervals after CIDR withdrawal. On Day 35 post-AI, pregnancy was diagnosed with ultrasonography. There was no significant difference in the size of the ovulatory follicle between eCG-treated buffaloes (ETB) and saline-treated buffaloes (STB). The growth rate of the dominant follicle, oestrus response and intensity, ovulation, and P/AI were higher (P <0.05) in eCG-treated buffaloes. It was concluded that eCG improved the growth rate of the dominant follicle, oestrus expression, and P/AI in a CIDR-based FTAI programme in Nili-Ravi buffalo. The deleterious effects of poor BCS, acyclicity, and low breeding season could be reduced with a progesterone-based fixed time AI protocol with the addition of eCG.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84513010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Does dietary inclusion of defatted yellow mealworm (Tenebrio molitor) affect growth and body composition of juvenile common carp (Cyprinus carpio)? 饲料中添加脱脂黄粉虫是否会影响鲤鱼幼鱼的生长和体成分?

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i4.04

A. Gebremichael, Z. Sándor, B. Kucska

{"title":"Does dietary inclusion of defatted yellow mealworm (Tenebrio molitor) affect growth and body composition of juvenile common carp (Cyprinus carpio)?","authors":"A. Gebremichael, Z. Sándor, B. Kucska","doi":"10.4314/sajas.v52i4.04","DOIUrl":"https://doi.org/10.4314/sajas.v52i4.04","url":null,"abstract":"The objective of this study was to evaluate the effects of total and partial replacement of fishmeal with defatted yellow mealworm (Tenebrio molitor) meal on one-summer-old common carp (Cyprinus carpio) with an initial bodyweight of 97.54 g ± 51.0 g. Fish were kept in an experimental recirculating aquaculture system (9 x 250 L tanks) and fed with two experimental diets formulated with mealworm meal replacements and one control, which had 100 g/kg fishmeal without mealworm meal (MWM0). In the first treatment, 50% of fishmeal was replaced with mealworm meal (MWM50). In the second treatment, fishmeal was replaced totally with mealworm meal (MWM100). Fish were fed three times per day at 3.0% of fish biomass. After six weeks of the experimental period, growth performance, nutrient utilization, body composition, and biometric indices were compared. The results revealed that the growth performance of common carp was not affected significantly by the inclusion level of mealworm meal. However, the highest weight gain was observed in MWM100, where specific growth rate was 0.76 ± 0.10 g/day. Crude fat content of the fish body differed significantly between experimental groups and the control. This investigation demonstrated that MWM could be used as an alternative dietary protein source to replace fishmeal without adverse effects on the growth performance of one-summer-old common carp.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87542891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of various pH levels on the sperm kinematic parameters of boars 不同pH值对公猪精子运动参数的影响

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i5.13

Cindy Rivas, M. E. Ayala, Andrés Aragón

{"title":"Effect of various pH levels on the sperm kinematic parameters of boars","authors":"Cindy Rivas, M. E. Ayala, Andrés Aragón","doi":"10.4314/sajas.v52i5.13","DOIUrl":"https://doi.org/10.4314/sajas.v52i5.13","url":null,"abstract":"The objective of this work was to identify the effects of pH on the structure of kinematic sperm subpopulations using commercial doses of boar semen diluted in Androstar Plus extender. We adjusted the pH value of the diluted semen samples to 7.4, 7.6, 7.8, and 8.0, and evaluated motility parameters using an open-source computer-assisted sperm analysis system. We evaluated the dataset of the kinematic parameters of the individual sperm for the effects of pH on the average values overall and on the subpopulations of sperm. To identify these subpopulations, we reduced the dimensionality of the dataset through principal component analysis followed by hierarchical clustering. We then compared the results for the kinematic parameters across the dataset and in the subpopulations with the average of the corresponding control (i.e., the basal pH value). We found that increasing the pH did not affect the proportion of motile sperm but did affect the manner in which they moved, rendering their movement more linear. The progressive motility increased relative to the control at all pH values above 7.1, while the proportion of sperm with low motility increased at pH 7.8. We distinguished three sperm subpopulations. The proportion of sperm in Subpopulation 1 increased at pH values of 7.8 and 8.0, with the sperm being characterized by low velocity and high values for linearity. The sperm in Subpopulation 3, by contrast, were relatively few but showed relatively high curvilinear velocity. In this study, we demonstrated the presence of subpopulations of boar sperm that responded differentially to changes in pH.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87289918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative energy value of cooked grease recovered from rinse-trap water lines used as dietary fat source for feedlot lambs 从冲洗疏水管道回收的熟油脂作为饲粮脂肪源的比较能值

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i5.12

A. Estrada-Angulo, J. Ramos-Méndez, J. D. Urías-Estrada, B. I. Castro-Pérez, A. Barreras, R. Zinn, L. Corona, X. Perea-Domínguez, I. G. Martínez-Alvarez, Alejandro Plascencia

{"title":"Comparative energy value of cooked grease recovered from rinse-trap water lines used as dietary fat source for feedlot lambs","authors":"A. Estrada-Angulo, J. Ramos-Méndez, J. D. Urías-Estrada, B. I. Castro-Pérez, A. Barreras, R. Zinn, L. Corona, X. Perea-Domínguez, I. G. Martínez-Alvarez, Alejandro Plascencia","doi":"10.4314/sajas.v52i5.12","DOIUrl":"https://doi.org/10.4314/sajas.v52i5.12","url":null,"abstract":"The objective of this experiment was to compare the effects of dietary supplementation with cooking grease recovered from rinse-trap water lines (rinse-trap grease; RTG) versus conventional supplemental fats (tallow; TL, and yellow grease; YG) on 84-d growth performance, dietary energy, and carcass traits of feedlot lambs. Forty-eight Pelibuey × Katahdin lambs (27.7 ± 3.4 kg) were assigned in a randomized complete block design to evaluate: 1) basal diet without supplemental fat (Control); 2) 4% TL; 3) 4% YG, and 4) 4% RTG. Supplemental fats replaced maize in the control diet. Rinse-trap grease contained greater moisture (16.5 vs 0.92%) and impurities (3.6 vs 0.56%), and less total fatty acid (64.90 vs 89.60%) than that of conventional fats (TL and YG). Daily weight gain and gain efficiency were similar for control and RTG supplemental lambs, whereas ADG and gain efficiency were greater for lambs fed conventional fats than control or RTG-supplemented lambs. Both dietary net energy (NE) as well as ratio of observed-to-expected dietary NE were 4% greater for lambs supplemented with conventional fats vs RTG. Supplemental fat increased fat deposition but did not affect any other carcass measures or non-fat visceral mass. Estimated NE value for RTG was 57% of the average NE value (6.11 Mcal/kg) of tested conventional fats. Supplementation with RTG does not affect diet acceptability, and accordingly, is a suitable energy source for feedlot lambs. However, due to its lower total fatty acid content, its energy value is much lower than conventional supplemental fats.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83943731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pre-rut behavioural changes in farmed red deer with reference to atmospheric conditions 养殖马鹿在发情期前的行为变化与大气条件有关

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i6.10

K. Tajchman, P. Janiszewski, Ż. Steiner-Bogdaszewska, F. Ceacero

{"title":"Pre-rut behavioural changes in farmed red deer with reference to atmospheric conditions","authors":"K. Tajchman, P. Janiszewski, Ż. Steiner-Bogdaszewska, F. Ceacero","doi":"10.4314/sajas.v52i6.10","DOIUrl":"https://doi.org/10.4314/sajas.v52i6.10","url":null,"abstract":"Red deer (Cervus elaphus) exhibit specific behaviour during the rutting season, which may have an impact on the safety on cervid farms, both due to aggressive interactions between animals and the safety of people staying there, such as staff and tourists. This issue applies especially to stags whose behaviour changes radically, and the correct interpretation of the observed changes is very important. Therefore, the aim of the study was to analyse the pre-rut behaviour of stags and to show the influence of atmospheric conditions on vocalization and other elements of their behaviour, which facilitate determination of the onset of the rutting season. The observations were conducted in August and September of 2017 and 2018. It was shown that lower temperatures, declines in air humidity, increasing atmospheric pressure, and transition of the moon phase towards the full moon resulted in intensification of the vocalization activity in the red deer in the pre-rutting season, which may accelerate the rutting period in the deer males. The number of vocalizations varied between the years and depended on the mean temperature, air humidity, atmospheric pressure, and moon phase in the prerutting and rutting seasons. Through observation of the changing weather conditions, it is possible to predict the time of increased activity of stags and the onset of the rutting period. Predicting the date of mating season in farm breeding, based on daily observations of changes in the behaviour of stags, can be helpful in planning veterinary treatments or selecting the composition of the hinds to be covered by specific stags, which can also contribute to the improvement of their welfare.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77111825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance and egg quality of light laying hens fed with canthaxanthin and marigold flower extract 角黄素和金盏花提取物对轻型蛋鸡生产性能和蛋品质的影响

IF 0.8 4区农林科学

South African Journal of Animal Science Pub Date : 2023-04-17 DOI: 10.4314/sajas.v52i4.03

K. M. Maia, D. Grieser, A. Ton, D. R. Aquino, M. F. Paulino, J. Toledo, S. Marcato

{"title":"Performance and egg quality of light laying hens fed with canthaxanthin and marigold flower extract","authors":"K. M. Maia, D. Grieser, A. Ton, D. R. Aquino, M. F. Paulino, J. Toledo, S. Marcato","doi":"10.4314/sajas.v52i4.03","DOIUrl":"https://doi.org/10.4314/sajas.v52i4.03","url":null,"abstract":"The aim of this study was to determine the best level of inclusion of natural (marigold flower extract) and synthetic (canthaxanthin) pigments in the diet of light laying hens from 75 to 85 weeks old in terms of effects on performance, egg quality, and economic viability of production. A total of 288 laying hens were used in a completely randomized design, with a 4 x 4 factorial arrangement, with four levels of marigold flower extract (2.10; 2.40; 2.70; 3.00 ppm) and four of canthaxanthin (0. 40; 0.70; 1.00; 1.30 ppm), with three replications and six hens per experimental unit. The feed conversion by mass of eggs, egg mass, and egg laying rate showed linear improvement with the inclusion of canthaxanthin. The yolk index showed a quadratic effect with the inclusion of marigold and canthaxanthin, presenting a better estimate with diets containing 2.60 ppm/kg of marigold feed and 0.95 ppm/kg of canthaxanthin feed. The percentage of yolk and the Haugh unit increased linearly with the rising levels of marigold, whereas the percentage of albumen decreased linearly. In the evaluation of the YolkFan DSM® and the redness/yellowness, chroma (a*) presented a quadratic effect for the inclusion of marigold (2.73 and 2.80 ppm/kg of feed) and linear increase with canthaxanthin. It was concluded that the best yolk index was with 2.60 ppm/kg marigold flower extract and 0.95 ppm/kg canthaxanthin in the diet of light laying hens from 75 to 85 weeks old.","PeriodicalId":21869,"journal":{"name":"South African Journal of Animal Science","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81681394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2