A repeatability assessment of sows mated 4-6 days after weaning in breeding herds
A repeatability assessment of sows mated 4-6 days after weaning in breeding herds
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DOI：
10.1016/j.anireprosci.2007.06.029
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发表时间：
2008-10-01
影响因子：
2.2
通讯作者：
Koketsu, Yuzo
中科院分区：
文献类型：
--
作者：
Hoshino, Yuko;Koketsu, Yuzo
本研究的目的是研究断奶至首次配种间隔（WMI）组与繁殖性能的关系，确定WMI组在连续胎次之间的可重复性和相关系数，并研究4-6天WMI母猪比例的相关因素。本研究使用了1999年在94个母猪群中出生的11,991头母猪的55,690次胎次记录。WMI分为5组：0-3、4-6、7-20、21-27和>= 28天。采用相关分析和方差成分分析确定WMI组的相关性和可重复性。采用混合效应模型分析WMI组与繁殖性能的关系，以及胎次、泌乳长度（LL）和哺乳仔猪与4 ~ 6 d WMI母猪比例的关系。WMI 4 ~ 6天的总比例为82.3%。WMI为4 ~ 6 d的母猪产仔率最高，产活猪数高于WMI为7 ~ 20 d的母猪（P < 0.01）。在每个胎次中，WMI为4 ~ 6 d的母猪去除胎次高于WMI为7 ~ 20 d的母猪（P < 0.01）。WMI组的重复性较低（0.08），连续胎次之间的相关系数也较低(0.10 = 2，第24 ~ 28天，9 ~ 10天哺乳仔猪发生WMI的可能性较高（P < 0.01）。综上所述，有任何WMI的母猪更有可能在断奶后4-6天配种，并且4-6天配种的母猪具有更高的繁殖性能和更长的寿命。增加LL可提高4 ~ 6天WMI母猪的比例。(c) 2007 Elsevier B.V.版权所有
The objectives of this study were to investigate the associations of weaning-to-first-mating interval (WMI) groups with reproductive performance, to determine the repeatability and the correlation coefficients in WMI groups between consecutive parities, and to investigate factors associated with the proportion of sows having WMI 4-6 days. This study was conducted using 55,690 parity records of 11,991 sows born during 1999 in 94 herds. Five groups of WMI were formed: 0-3, 4-6, 7-20, 21-27, and >= 28 days. The correlation and the repeatability of the WMI groups were determined using correlation analysis and variance component analysis. Mixed-effects models were used to analyze the associations of WMI groups with reproductive performance, and the associations of parity, lactation length (LL), and nursing piglets with the proportion of sows having WMI 4-6 days. The overall proportion of the WMI 4-6 days was 82.3%. Sows with WMI 4-6 days had the highest farrowing rate, and had more pigs born alive than those with WMI 7-20 days (P < 0.01). At each farrowed parity, sows with WMI 4-6 days had higher parity at removal than those with WMI 7-20 days (P < 0.01). The repeatability of the WMI groups was low (0.08), and the correlation coefficients of WMI groups between consecutive parities were also low (0.10 = 2, LL 24-28 days, and 9-10 nursing piglets were more Likely to have WMI 4-6 days (P < 0.01). In conclusion, sows having any WMI were more likely to be mated on 4-6 days postweaning at subsequent parity, and sows mated on 4-6 days had higher reproductive performance and higher longevity. Increased LL may increase the proportion of sows having WMI 4-6 days. (c) 2007 Elsevier B.V. All rights reserved.