Study of Persistency of lactation and Survival of Iranian Holstein dairy cattle using Random Regression Model

IF 1.2 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Canadian Journal of Animal Science Pub Date : 2023-08-03 DOI:10.1139/cjas-2023-0007

A. Ashrafian, nasser emam jomeh kashan, M. Abbasi, A. Sadeghi, M. Rokouei

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引用次数: 0

Abstract

The aim this paper is to investigate whether characteristics of the first lactation (FL) curve of Iranian Holstein cows is associated with survival. Cows with least 10 Test days of milk production in their FL were used. The persistency of lactation (PL) and survival were estimated using a Random Regression Model by REML with the ECHIDDNA software. We also used the Wood model to parameterize each individual lactation curve and then analyze various curve characteristics using an animal model. The EBV of the characteristics of the lactation curve of the cows from day 40-305 predicted. The EBV of the production range (PR) and the slope of line in increasing phase (m_(40,Peak)) of production curve of sires with higher survival EBV were lower than other sires (p˂0.05). The estimates of LP were independent of survival estimate. Therefore, the PR from 40th day after calving can be considered as a definition of PL. Because the lower the PR, the flatter is the milk production curve. Genetic evaluation of young bulls for survival needs the data of death or culling of their daughters. Therefore, the bulls can genetically be evaluated for survival according to the LP and m_(40,Peak) of FL information of their daughters.

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应用随机回归模型研究伊朗荷斯坦奶牛泌乳持久性和存活率

本文的目的是研究伊朗荷斯坦奶牛第一泌乳（FL）曲线的特征是否与生存有关。使用FL中产奶量至少为10个试验日的奶牛。使用REML和ECHIDDNA软件的随机回归模型估计泌乳持续性（PL）和存活率。我们还使用Wood模型对每个个体的泌乳曲线进行参数化，然后使用动物模型分析各种曲线特征。对奶牛泌乳曲线特征的EBV从第40-305天开始进行预测。存活EBV较高的父系的生产范围（PR）的EBV和生产曲线增加期的斜率（m_（40，Peak））均低于其他父系（p＜0.05）。LP的估计值与存活估计值无关。因此，产仔后第40天的PR可以被视为PL的定义。因为PR越低，产奶曲线就越平坦。幼公牛生存的基因评估需要其女儿的死亡或扑杀数据。因此，可以根据其女儿的FL信息的LP和m_（40，Peak）对公牛的存活进行遗传评估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Canadian Journal of Animal Science 农林科学-奶制品与动物科学

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

6 months

期刊介绍： Published since 1957, this quarterly journal contains new research on all aspects of animal agriculture and animal products, including breeding and genetics; cellular and molecular biology; growth and development; meat science; modelling animal systems; physiology and endocrinology; ruminant nutrition; non-ruminant nutrition; and welfare, behaviour, and management. It also publishes reviews, letters to the editor, abstracts of technical papers presented at the annual meeting of the Canadian Society of Animal Science, and occasionally conference proceedings.