The occurrence of decreased numbers of pigs born alive in parity 2 sows does not negatively affect herd productivity in Japan
The occurrence of decreased numbers of pigs born alive in parity 2 sows does not negatively affect herd productivity in Japan
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日本 2 胎母猪的活产仔猪数量减少不会对猪群生产力产生负面影响
DOI：
10.1016/j.livsci.2009.10.014
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
Y. Koketsu
中科院分区：
文献类型：
--
作者：
H. Saito;Y. Sasaki;Y. Hoshino;Y. Koketsu
本研究的目的是评估第二胎次(D-PBA)母猪产活仔数(PBA)减少的情况，并通过对比第一胎和第二胎(SPBA)和非生产性母猪日(NPD)的PBA总和来评估D-PBA母猪和猪群的重要性。这项研究评估了从2001年到2005年的106头母猪和母猪的年度数据，包括137,360头在第一胎和第二胎产下的68,680头母猪的分娩记录。D-PBA的定义是在母猪或猪群水平上，第二胎产的PBA数量与第一胎产的相同或更少。母猪或猪群被分成两组：D-PBA或胎次2增加的PBA(I-PBA)。NPD定义为第一胎母猪既不妊娠也不哺乳的天数。采用混合效应模型比较两组母猪的繁殖性能。在68680头母猪中，49.5%的母猪出现了D-PBA。D-PBA母猪的产仔量比I-PBA母猪少0.3头，但第一胎的NPD比I-PBA母猪短1.9天(P<；0.05)。在研究的五年中，D-PBA牛群的年均比例为16%。D-PBA群和I-PBA群在每头交配母猪年断奶数(PWMFY)、任何年份的SPBA或NPD方面没有差异。此外，PWMFY在任何年份都与D-PBA母猪的比例或第一胎和第二胎的PBA差异不相关。总之，在所研究的日本猪群中，D-PBA的出现似乎不是一个严重的问题。
The objectives of this study were to assess the occurrence of decreased numbers of pigs born alive (PBA) in parity 2 (D-PBA) and to evaluate the importance of D-PBA sows and herds by analyzing against using the summed numbers of PBA in parity 1 and 2 (SPBA) and nonproductive sow days (NPD). The study assessed annual data from 2001 to 2005 from 106 herds, and sow data including 137,360 farrowing records of 68,680 sows farrowed in parity 1 and 2. D-PBA was defined as the same or fewer numbers of PBA in parity 2 than that in parity 1 at either the sow or herd level. Sows or herds were categorized into two groups: D-PBA or increased PBA in parity 2 (I-PBA). NPD was defined as the number of days that sows were neither gestating nor lactating in parity 1. Mixed-effects models were used to compare the reproductive performance between the two groups. Of the 68,680 sows, 49.5% had an occurrence of D-PBA. D-PBA sows had 0.3 pigs fewer SPBA than I-PBA sows, but those sows had 1.9days shorter NPD in parity 1 than I-PBA sows (P<0.05). Over the five years studied the average annual proportion of D-PBA herds was 16%. No differences were found between the D-PBA and I-PBA herds in the number of pigs weaned per mated female per year (PWMFY), SPBA or NPD in any year. Additionally, the PWMFY was not correlated in any years with either the proportions of D-PBA sows or the difference in PBA between parity 1 and 2. In conclusion, the occurrence of D-PBA does not appear to be a serious problem in Japanese swine herds studied.