Estimation of genetic parameters for dairy traits using repeatability animal models based on test-day data for Alpine goat in Croatia

IF 1.1 4区农林科学 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Mljekarstvo Pub Date : 2019-10-04 DOI:10.15567/mljekarstvo.2019.0401

M. Špehar, Ante Kasap, B. Mioč, Z. Barač, Danijel Mulc

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引用次数: 3

Abstract

The objective of this study was to estimate genetic parameters for daily milk yield (DMY), fat (FC), and protein content (PC) using 329.022 test-day records of 23.756 Alpine does. Single trait repeatability animal model was applied. Parity, litter size, season, and lactation stage (Ali-Schaeffer’s curve) were fitted in the fixed, while herd, herd-test-day, permanent environment (within lactations) and additive genetic effect in the random part of the model. Variance components were estimated using Residual Maximum Likelihood Method in the VCE-6 program. Additive genetic effect explained 23 %, 16 % and 25 % of DMY, FC and PC variability which is in general agreement with numerous previous reports for dairy goat breeds. Among the non-genetic effects, herd explained 24 %, 12 %, and 9 %, herd-test-day 17 %, 29 %, and 30 %, and permanent environment 16 %, 3 %, and 5 % of DMY, FC and PC variability, respectively. The estimated parameters and developed single trait repeatability test-day models will serve as a basic tool in BLUP based genetic evaluation of Alpine breed in Croatia.

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基于克罗地亚高山山羊试验日数据的可重复性动物模型对奶牛性状遗传参数的估计

本研究旨在利用23756头高山公羊的329.022试验日记录，估算日产奶量(DMY)、脂肪(FC)和蛋白质含量(PC)的遗传参数。采用单性状重复性动物模型。模型的固定部分拟合胎次、产仔数、季节和泌乳期(Ali-Schaeffer’s曲线)，随机部分拟合畜群、试畜日、永久环境(泌乳期)和加性遗传效应。方差成分在VCE-6程序中使用残差最大似然法估计。累加性遗传效应解释了23%、16%和25%的DMY、FC和PC变异，这与之前许多关于奶山羊品种的报告基本一致。在非遗传效应中，畜群对DMY、FC和PC变异的解释分别为24%、12%和9%，畜群测试日对DMY、FC和PC变异的解释分别为17%、29%和30%，永久环境对DMY、FC和PC变异的解释分别为16%、3%和5%。估计的参数和开发的单性状重复性测试日模型将作为基于BLUP的克罗地亚高山品种遗传评价的基本工具。

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来源期刊

Mljekarstvo Agricultural and Biological Sciences-Animal Science and Zoology

CiteScore

1.90

自引率

41.70%

发文量

审稿时长

12 weeks

期刊介绍： Mljekarstvo is an open access, peer-reviewed international quarterly scientific journal. The first issue was published in 1951, by the Croatian Dairy Operators'' Association (today: Croatian Dairy Union, publisher). In a paper at a Union conference held 28 October 1951 in Zagreb it was said: "Our desire is that this magazine does not meet the fate of its predecessors, but that it continues to reflect the creative efforts and to provide guidelines for the producers as well as all other operators employed in the dairy industry." It is our pleasure today to say that wishes of the enthusiasts who attended the conference have come true, and the magazine Mljekarstvo during the last six decades was a reflection of the creative efforts of numerous dairy scientists and experts, and through its texts it served as a guideline in improving production and processing of milk and dairy products. Mljekarstvo has been following all the achievements of the dairy profession in Croatia, and it also gives the short surveys of world achievements. The result of the research of local and foreign scientists and experts always find their place in the magazine Mljekarstvo. It has been edited by our outstanding dairy experts employed at colleges, research institutions and dairy companies.