Effect of parity on lactation traits in crossbred HolsteinFriesian in Ethiopia

Journal of Livestock Science

article

E.K. Senbeta¹  A.S. Abebe¹ 

[1] School of Animal and Range Sciences, Haramaya University

关键词: Crossbred cow;    Lactation stages;    Milk yield;    Parity;   

DOI  :  10.33259/JLivestSci.2021.176-183

学科分类：农业科学（综合）

来源: Journal of Livestock Science

【 摘 要 】

This study has assessed the effects of parity on lactation length, lactation milk yield, and lactation curves for eachlactation stage at Haramaya University dairy research and teaching farm. Thirty-one synchronized Holstein Frisiancrossbred heifers; with nearly similar age were selected and stall-fed for the whole lactation period. Data werecollected on daily milk yield at each stage, days in milk and lactation milk yield, 305 days milk yield, and analyzedusing the t-test for means. There was an insignificant effect on lactation length, total lactation milk yield, 305 daystotal milk yield, mid and late lactation milk yield between the 1st and 2nd lactation numbers. The rate of variation wasvery high (13.4%) during the early lactation stage. The daily milk yield was significantly influenced by parity(P<0.05). The variation rate of milk yield in the morning milking was ranging from 10- 51%.Further study isrequired to examine additional aspects of parity on lactation traits such as milk composition and reproductive traitswith more lactation numbers.

【 授权许可】

Unknown