Austral Journal of Veterinary Sciences最新文献_第8页

Estimation of genetic parameters for milk yield using a random regression test-day model in first parity dairy cows under pasture-based systems of Los Ríos region in Chile 利用随机回归试验日模型对智利Los Ríos地区牧场一胎奶牛产奶量的遗传参数进行估计

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2020-09-01 DOI: 10.4067/s0719-81322020000300103

H. Uribe, F. Lembeye

{"title":"Estimation of genetic parameters for milk yield using a random regression test-day model in first parity dairy cows under pasture-based systems of Los Ríos region in Chile","authors":"H. Uribe, F. Lembeye","doi":"10.4067/s0719-81322020000300103","DOIUrl":"https://doi.org/10.4067/s0719-81322020000300103","url":null,"abstract":"In dairy cattle, genetic selection for milk yield was generally based on 305 days lactation records that were calculated from available monthly test-day milk yield records. A test-day milk yield record, multiplied by the number of days between the current and following test-day, was the monthly milk yield and summed to all other monthly milk yields represented a 305 days lactation yield. Cows that for any reason did not complete their lactation got a 305 days yield via correction factors assuming a common lactation curve. Random regression models allow individual deviation from a common curve. The objective of this study was to estimate genetic parameters for daily milk yield using a random regression model (RRM) in Chilean dairy cows. A data set containing 97,683 monthly test-day records of 10,528 cows from 15 commercial dairy herds of Los Rios Region in southern Chile was used. Days in milk (DIM) were modelled using the fourth-order Legendre polynomials and the model also included, as fixed effects, contemporary group and cow age at test-day as a covariate. The average daily milk yield was 17.83 ± 5.25 kg. Average estimated heritability and repeatability from five to 305 DIM was 0.26 ± 0.02 and 0.61 ± 0.04, respectively. The heritability estimate varied from 0.23 to 0.31. Both parameters did not vary dramatically except after 270 DIM when repeatability increased while heritability decreased. Although the estimated genetic parameters did not seriously depart from the most recent results available in the Chilean literature, they are mathematically more precise for estimating the true parameters than those calculated using adjustment factors, suggesting that the model used could be the starting point to develop a genetic evaluation system for dairy cattle in Chile.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44585655","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

Methane production: Where should we focus our attention? 甲烷生产:我们应该把注意力集中在哪里?

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2020-01-01 DOI: 10.4067/s0719-81322020000100101

Editorial committee

引用次数: 0

The effect of ginger on testis of Broiler breeders 生姜对肉种鸡睾丸的影响

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200067

Mansour Hamzehnezhad, H. Erik-aghaji, A. Zakeri, S. Hejazi

{"title":"The effect of ginger on testis of Broiler breeders","authors":"Mansour Hamzehnezhad, H. Erik-aghaji, A. Zakeri, S. Hejazi","doi":"10.4067/S0719-81322019000200067","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200067","url":null,"abstract":"Abstract: The rhizome of ginger is a fresh or dried organ of the plant Zingiber officinale, which has been used as a medicine since ancient times. The present study was conducted to examine the effects of ginger on testicular histomorphometry in roosters of broiler chicken flocks. Eighty single-day rooster of broiler chickens belonging to 308 Ross breed was used in the present study. The chickens were divided into two groups with 40 broiler roosters (experimental and control groups). Initially, the rhizome of ginger was powdered; 1 g/kg of ginger powder was added to the ration of the group treated with ginger from the beginning of the breeding season. The blood samples were taken from each chick at 20 weeks of age. The samples were stained with H&E. Data was expressed as mean ± SD. T-test was used to analyse and compare the difference between the control is also an experimental groups using SPSS 9.0 software. The testosterone level, weight of the testicle, thickness of seminal tube and number of spermatids in the experimental group compared to the control group increased significantly P<0.05. The most important difference between the control and the intervention group treated with ginger was the number and density of spermatids and spermatozoids cells in the lumen area of the seminal tubes. The present study obtained positive results for the efficacy of using ginger in roosters of broiler chick flocks.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48706142","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: 1

Electrochemotherapy in the treatment of neoplasms in dogs and cats 电化学疗法治疗猫狗肿瘤

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200045

M. Rangel, Jean C.S. Luz, K. D. Oliveira, J. Ojeda, J. Freytag, D. Suzuki

{"title":"Electrochemotherapy in the treatment of neoplasms in dogs and cats","authors":"M. Rangel, Jean C.S. Luz, K. D. Oliveira, J. Ojeda, J. Freytag, D. Suzuki","doi":"10.4067/S0719-81322019000200045","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200045","url":null,"abstract":"Abstract: Electrochemotherapy (ECT) is a technique that combines chemotherapy with local application of specific electric pulses with the aim of increasing the permeability of the plasma membrane in a reversible way, improving the influx of chemotherapeutic drugs into the cytoplasm and potentiating their cytotoxic effects. This technique has broadened the range of possible treatments for oncological patients, either on its own or as adjuvant to surgical procedures. It is especially useful in tumors located in regions with only a small surgical safety margin, such as the limb extremities, skull, oral cavity, neck and perianal region, among others. ECT makes it feasible to perform procedures more conservatively, or even to perform otherwise infeasible procedures, by expanding the margins without removing healthy tissues. The objective of this paper is to provide a brief bibliographic review of the principles, applications and future possibilities of electrochemotherapy, helping to disseminate pertinent information about this relatively new technique for the treatment of cancer.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200045","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47689362","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: 12

The effect of non-traditional cooling on dog sperm cryosurvival and ability to perform the acrosome reaction 非传统冷却对犬精子低温存活及顶体反应能力的影响

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200073

Luis D. Ortega-Morales, A. Alcántar-Rodríguez, M. C. Espejel, A. Medrano

{"title":"The effect of non-traditional cooling on dog sperm cryosurvival and ability to perform the acrosome reaction","authors":"Luis D. Ortega-Morales, A. Alcántar-Rodríguez, M. C. Espejel, A. Medrano","doi":"10.4067/S0719-81322019000200073","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200073","url":null,"abstract":"Abstract: The objective of this study was to assess cryosurvival, plasma membrane fluidity, and capability of cryopreserved dog (Canis lupus familiaris) spermatozoa, cooled to -5 °C before freezing, to perform the acrosome reaction under the effect of progesterone and calcium ionophore. In the first experiment, fresh spermatozoa diluted in Tyrode’s medium plus albumin, lactate, and pyruvate (TALP) were incubated at 38 °C in 5% CO2 in air, with progesterone or calcium ionophore added at 2, 4, and 6 h after incubation and sampled 30 min later to assess the acrosome reaction. In the second experiment, diluted sperm were packaged in plastic straws, cooled to either +5 °C or -5 °C and cryopreserved. Progressive motility, plasma membrane integrity and fluidity, capacitation status and acrosome integrity were assessed before and after freeze-thawing. After thawing, sperm were assessed, resuspended in TALP and incubated to assess the acrosome reaction. Parameters for sperm cryosurvival were similar in sperm cooled to either +5 °C or -5 °C, except in the percentage of hyper-fluid membranes which was lower (P<0.05) in sperm cooled to -5 °C. There were no differences in the percentages of frozen-thawed spermatozoa with acrosome reaction, induced by progesterone or calcium ionophore, between cooling treatments. In conclusion, cooling of dog spermatozoa to -5 °C did not improve sperm cryosurvival but had a positive effect on plasma membrane fluidity.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44907205","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: 1

The magic number 神奇的数字

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/s0719-81322019000200001

引用次数: 0

Burnout syndrome prevalence in veterinarians working in Chile 在智利工作的兽医的倦怠综合征患病率

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200091

Romy M. Weinborn, Braulio J. Bruna, Joan Calventus, G. A. Sepúlveda

{"title":"Burnout syndrome prevalence in veterinarians working in Chile","authors":"Romy M. Weinborn, Braulio J. Bruna, Joan Calventus, G. A. Sepúlveda","doi":"10.4067/S0719-81322019000200091","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200091","url":null,"abstract":"Abstract: Burnout Syndrome is a psycho-emotional syndrome that affects workers in any activity or profession. In recent years, veterinarians have been described as one of the most affected professionals, which has motivated the development of this research. The primary objective of this work was to determine the prevalence of Burnout Syndrome in veterinarians working in Chile. We evaluated the possible correlation of Burnout Syndrome with socio-demographic variables. The Socio-Demographic Characterization Survey and the Maslach Burnout Syndrome Inventory-General Survey (MBI) were applied to 521 participants, who were contacted through the Veterinary Medical Association of Chile (COLMEVET) and social networks. Fisher and Chi-square statistical tests and correspondence analysis were used to determine the association among variables. The prevalence of Burnout Syndrome in Chilean veterinarians was 24% (124/521). There was statistical significance between Burnout Syndrome and the variables ‘years in employment’ and ‘monthly salary’. There is a high prevalence of Burnout Syndrome in veterinarians working in Chile that was related to the variables ‘years in employment’ and ‘monthly salary’. Prevention using psychological therapy could reduce the incidence of symptoms linked to adaptive difficulties, cognitive discrepancies, psychological discomfort, and emotional regulation, promoting health improvement and resistance to Burnout Syndrome in Chilean veterinarians. This research corresponds to the first exploratory study related to the subject in Chile.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200091","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44337515","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: 3

Hemicastration in Chilean rodeo stallions in competition 智利竞技场上牡马的麻醉

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200101

L. Muñoz, Consuelo Blu, R. Ortiz, J. Cruces, M. Cordero, M. Briones

{"title":"Hemicastration in Chilean rodeo stallions in competition","authors":"L. Muñoz, Consuelo Blu, R. Ortiz, J. Cruces, M. Cordero, M. Briones","doi":"10.4067/S0719-81322019000200101","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200101","url":null,"abstract":"Abstract: The objectives of this study were: a) establish the frequency, age and reason for hemicastration, b) determine the most frequently removed testicle and c) compare the athletic performance between unilaterally castrated and intact Chilean rodeo stallions. Two hundred and sixteen Chilean Horse stallions participating in the 2016 Chilean rodeo qualifying rounds and National Championship (CRNC) were evaluated. Owners and/or riders were interrogated about age, hemicastration, age at hemicastration, removed testicle, reason and effects of hemicastration on athletic performance of stallions. The statistical analysis was descriptive and the results were expressed in means and percentages. Chi-square test was used to compare the performance between unilaterally castrated and intact stallions. Performance was qualified based on qualification to the CRNC and ultimately participation in the Champion series. Fifty-three percent of the stallions were unilaterally castrated (47% left testicle; 53% right testicle) (P>0.05). Mean age of hemicastration was 6.97±2.24 years. Main reasons reported for hemicastration were: traumatic (76%), increased volume (13%) and preventive (11%), but not all of them with medical confirmation. Seven owners or riders were unaware of the reason of hemicastration. Forty-six percent of the qualified stallions to the CRNC (P>0.05) and 29% of the qualified to the Champion series were unilaterally castrated (P=0.0122). It was concluded that half of the 2016 elite Chilean Horse stallions were unilaterally castrated, without preference for a testicle, after the age of initiation of sporting activity. A 43.5% of hemicastration in Chilean rodeo stallions are performed preventively or based on subjective assessments of owners and riders without veterinary diagnosis, however, it is unclear that hemicastration affected the athletic performance in these cases.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41983729","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

Evaluation of reduced amino acids diets added with protected protease on productive performance in 25-100 kg barrows 添加保护性蛋白酶的氨基酸还原日粮对25-100kg肥牛生产性能的评价

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200053

J. L. Figueroa, J. A. Martínez, M. T. Sánchez-Torres, J. Cordero, M. Martínez, V. M. Valdez, A. Ruiz

{"title":"Evaluation of reduced amino acids diets added with protected protease on productive performance in 25-100 kg barrows","authors":"J. L. Figueroa, J. A. Martínez, M. T. Sánchez-Torres, J. Cordero, M. Martínez, V. M. Valdez, A. Ruiz","doi":"10.4067/S0719-81322019000200053","DOIUrl":"https://doi.org/10.4067/S0719-81322019000200053","url":null,"abstract":"Abstract: The objective of this research was to evaluate the effect of adding protected protease to low-amino acids (AA) diets on the growth performance of barrows. Three decreasing levels of AA (protein levels), with or without the addition of protease were fed to 48 hybrid barrows (27.42±3.48 kg initial body weight). The experimental design was a completely randomised with a factorial arrangement of treatments. An analysis of variance was performed with GLM of SAS and the means comparison was performed with Tukey test (P 0.05). Only in growing barrows, the interaction of standard protein diet and protease reduced backfat thickness (P 0.05) growth performance variables. Low-protein diets increased (P<0.05) average daily gain, final body weight and fat-free lean gain in growing and finishing II barrows. Concentration of urea in plasma decreased with the reduction of CP and increased with the addition of protease (P<0.05) at the three stages. In conclusion, low protein diets improved or maintained growth performance variables and reduced the plasma urea nitrogen, whereas supplementation with protease did not show any effect on productive performance.","PeriodicalId":56042,"journal":{"name":"Austral Journal of Veterinary Sciences","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.4067/S0719-81322019000200053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43581045","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: 3

Comparison of yield characteristics of Damascus and Kilis goats in dry climatic conditions 干旱气候条件下大马士革山羊和基利斯山羊产量特征的比较

IF 0.9 4区农林科学

Austral Journal of Veterinary Sciences Pub Date : 2019-05-01 DOI: 10.4067/S0719-81322019000200061

A. Tatar, S. S. Tuncer, H. D. Şireli

引用次数: 5