摘要
为探究非遗传因素对荷斯坦牛测定日乳糖率(lactose percentage,LP)的影响,并估计测定日乳糖率的遗传力及其与体细胞评分(somatic cell score,SCS)、产奶量之间的遗传相关,试验收集了北京地区2017-2019年6个牧场11554头荷斯坦牛的测定日生产性能记录,采用Mixed模型分析了影响测定日乳糖率的非遗传因素,基于DMU软件的DMUAI模块使用重复力模型估计了测定日乳糖率、SCS和产奶量的遗传参数,分析了测定日乳糖率的遗传趋势。结果显示,北京地区荷斯坦牛测定日乳糖率平均值为5.10%,胎次、泌乳阶段、牧场、测定年和测定季节对乳糖率均有极显著影响(P<0.01)。北京地区荷斯坦牛测定日乳糖率的遗传力估计值为0.097,高于同群体SCS性状;重复力估计值为0.162。1994-2019年,乳糖率性状的估计育种值总体呈升高趋势。乳糖率与SCS、产奶量之间分别存在中等至低的遗传相关,遗传相关系数分别为-0.49和0.28。上述结果表明,在遗传水平上,乳糖率越高的个体,其产奶量越高,体细胞数越低。本研究在中国牛群中对测定日乳糖率的遗传建模分析进行了有益尝试,利用大规模数据初步揭示了测定日乳糖率的遗传规律。
In order to explore the impacts of non-genetic factors on test-day lactose percentage(LP)in Holstein cows,and estimate the heritability of test-day LP and its genetic correlations with somatic cell score(SCS)and milk yield(MY),the test-day DHI records of 11554 lactating cows from 6 herds were collected from 2017 to 2019 in Beijing.A mixed linear model was used to analyze the impacts of influencing factors affecting test-day LP,and the repeatability model were employed to estimate the genetic parameters for test-day LP,SCS and MY using the DMUAI module of DMU software.Furthermore,the genetic trend of test-day LP was also analyzed.The results showed that the average of test-day LP was 5.10%in Holstein cows in Beijing.The parity,lactation stage,herd,test year and test season had extremely significant impacts on LP(P<0.01).The heritability estimate for test-day LP was 0.097,which was higher than that of SCS,and the repeatability estimate was 0.162 in Holstein cows in Beijing.In general,an increasing trend was observed according to estimated breeding value of test-day LP from 1994 to 2019.The genetic correlations of LP with SCS(-0.49)and MY(0.28)were moderate to low,which indicated the cows with higher LP would have the higher MY and the lower somatic cell count.In this study,the results were beneficial for in-depth genetic modeling analysis for test-day LP,and the genetic foundation of test-day LP was initially revealed.
作者
余厚默
竹磊
张海亮
常瑶
杨桐桐
郭刚
刘林
王雅春
YU Houmo;ZHU Lei;ZHANG Hailiang;CHANG Yao;YANG Tongtong;GUO Gang;LIU Lin;WANG Yachun(Key Laboratory of Animal Genetics,Breeding and Reproduction(MARA),NationalEngineering Laboratory for Animal Breeding,College of Animal Science and Technology,China Agricultural University,Beijing 100193,China;College of Animal Science,Xinjiang Agricultural University,Urumqi 830052,China;Beijing Sunlon Livestock Development Company Limited,Beijing 100176,China;BeijingDairy Cattle Center,Beijing 100192,China)
出处
《中国畜牧兽医》
CAS
北大核心
2021年第12期4520-4529,共10页
China Animal Husbandry & Veterinary Medicine
基金
国家现代农业产业技术体系(CARS_36)
长江学者和创新团队发展计划(IRT_15R62)
农业品种改良提升专项(2130135)
北京三元种业科技股份有限公司自立科研课题(SYZYZ20190005)。
关键词
乳糖率
体细胞评分
产奶量
奶牛
乳房健康
lactose percentage
somatic cell score
milk yield
dairy cows
breast health
