影响西农萨能奶山羊产奶性状的非遗传因素分析

doi:10.16431/j.cnki.1671-7236.2021.02.017

Abstract

Abstract: This experiment was aimed to explore the influence of four fixed effects of birth year,season,parity,and lactation stage on milk production traits of Xinong Saanen dairy goat.A total of 645 lactating does from 2006 to 2018 in the Xinong Saanen dairy goat breeding farm of Northwest A&F University were used as the research objects.Milk samples were collected once a month and collected once every morning and evening on the sampling day.Two milk samples from the same individual were mixed in equal proportions,which were determined through milk composition analyzer to obtain the concentrations of eight indexes including milk fat percentage,milk protein percentage,lactose percentage,total solids,non-lipid solid,density,freezing point and acidity.Combined with the milk production records of the farm,the fixed-effect model was used to perform descriptive statistical analysis of the phenotype through SAS 9.4,and then the GLM model was applied to analyze the impact of fixed-effects on milk production traits.The results showed that the average milk yield of Xinong Saanen dairy goats in 300 days was 507.67 kg,the milk fat percentage was 3.58%,the milk protein percentage was 3.20%,the lactose percentage was 4.19%,the total solids content was 12.21%,and the non-lipid solid content was 8.46%.The milk yield was extremely significantly affected by birth year and parity (P<0.01),while the birth season had no significant effect on milk yield (P>0.05).The lactation stage and birth year had extremely significant effects on all eight milk component traits including milk fat percentage (P<0.01).The parity had a extremely significant effect on six milk component traits except milk protein percentage and total solids(P<0.01).The results revealed that the parity and lactation stage were the two main non-genetic factors influencing the milk production traits of Xinong Saanen dairy goats.The third and forth parity had the best milk production performance.The milk quality in the early lactation stage was much better.Our findings revealed the potential importance of the selective breeding of excellent dairy goat population and feeding and management,which would further provide a theoretical basis for the genetic evaluation of economic traits and population genetic improvement of Xinong Saanen dairy goats.

Key words: Xinong Saanen dairy goat; milk yield; milk composition; fixed effect; parity; lactation stage

CLC Number:

S827

ZENG Xin, WANG Wanting, ZANG Saige, YUE Ziting, LUO Jun, LI Cong. Analysis of Non-genetic Factors Affecting Milk Production Traits of Xinong Saanen Dairy Goat[J]. China Animal Husbandry and Veterinary Medicine, 2021, 48(2): 554-562.

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Analysis of Non-genetic Factors Affecting Milk Production Traits of Xinong Saanen Dairy Goat

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