译 名：
Effect of Calving Season on Lactation Performance of Firstcalf for Holstein Heifer Cows
作 者：
LIAO Xiang-xiang1,ZHANG Mei-rong1,XU Zhao-jun1,CHEN Dan1,MAO Yong-jiang1,2,LIU Kun3, CHEN Liang3,WANG Xing-long1,YANG Zhang-ping*1,YANG Li-guo2 (1.Animal Science and Technology College,Yangzhou University,Yangzhou,Jiangsu 225009;2.Animal Genetics,Breeding and Reproduction Key Laboratory of Chinese Ministry of Education,College of Animal Science and Technology,Huazhong Agricultural University,Wuhan,Hubei 430070;3.Haifeng Dairy Cattle Farm,Shanghai Dairy Group,Dafeng,Jiangsu 224100)
关键词：
holstein imported from australia;calfing season;lactation performance
摘 要：
【Objective】In order to study the effect of different calving season on lactation performance of firstcalf for Holstein heifer cows,so as to provide scientific basis for reasonable arrangement of mating time of Holstein cows in Yangtze river.【Method】The data of calving season and their first child,lactation performance were from 2480 Holstein Imported from Australia of Haifeng Dairy Co.,Ltd.in 2009,the effect of different calving season on lactation days of the first child,all the actual lactation milk yield,305 days corrected milk,305 days fat yield and protein yield in 305 days were analyzed.【Results】The results showed that: Different calving seasons for the first child significantly affected the full lactation milk yield(P<0.01) and fat yield 305 days(0.01
