新疆褐牛与中国西门塔尔牛乳尿素氮的遗传参数估计

doi:10.16431/j.cnki.1671-7236.2025.03.022

Abstract

Abstract: 【Objective】 This study was aimed to comprehensively evaluate the health and nutritional status of Xinjiang Brown cattle and Chinese Simmental cattle,and optimize the feeding management strategy,so as to achieve the purpose of improving their overall production performance.【Method】 The data of DHI of 702 Xinjiang Brown cattle (1 085 records) and 4 079 Chinese Simmental cattle (6 352 records) from four cattle farms in Xinjiang from 2016 to 2023 were collected.The effects of farm,calving year,calving season and parity on milk urea nitrogen were analyzed using SAS 9.2 software.The genetic parameters of urea nitrogen in milk of Xinjiang Brown cattle and Chinese Simmental cattle were estimated using a single trait repeatability model by DMU software.【Result】 The farm and calving year had extremely significant effects on milk urea nitrogen in Xinjiang Brown cattle and Chinese Simmental cattle (P＜0.01).The calving season had an extremely significant effect on milk urea nitrogen in Chinese Simmental cattle (P＜0.01).The parity had significant or extremely significant effect on milk urea nitrogen in Xinjiang Brown cattle and Chinese Simmental cattle (P＜0.05 or P＜0.01).The heritability of milk urea nitrogen in Xinjiang Brown cattle and Chinese Simmental cattle were 0.10±0.05 and 0.15±0.03,respectively,both of which belonged to low heritability.The average estimated breeding value of milk urea nitrogen increased with the increase of calving year.【Conclusion】 The milk urea nitrogen of the two breeds of cattle was a low heritability trait.In recent years,the genetic trends of milk urea nitrogen in Chinese Simmental cattle had increased,while had shown a decreasing trend in Xinjiang Brown cattle.Therefore,attention should be paid to the influence of different factors on milk urea nitrogen,and the feeding and management methods should be adjusted reasonably to strengthen the importance of its selection.The results provided a theoretical basis for improving the production performance of the two breeds of cattle.

Key words: Xinjiang Brown cattle; Chinese Simmental cattle; milk urea nitrogen; genetic parameters

CLC Number:

S823.2

MA Kailun, LI Xue, ZHANG Xiaoxue, ZHANG Tao, ZHANG Menghua, WANG Dan, XU Lei, HUANG Xixia. Estimation of Genetic Parameters of Milk Urea Nitrogen in Xinjiang Brown Cattle and Chinese Simmental Cattle[J]. China Animal Husbandry and Veterinary Medicine, 2025, 52(3): 1202-1210.

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Estimation of Genetic Parameters of Milk Urea Nitrogen in Xinjiang Brown Cattle and Chinese Simmental Cattle

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