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Length of productive life of sows in four pig farms in the tropics of Mexico

机译：墨西哥热带地区四个养猪场母猪的生产寿命

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摘要

The objective of this study was to determine the effect of some factors on the length of productive life (LPL), the number of parities (NP), and the culling interval (CI) of sows. The information from 2003 to 2009 of 3,746 sows with LPL and NP records and 5,819 sows with CI records from the four farms of Yucatan, Mexico was used. LPL was defined as the number of days between the first farrowing and culling or death and CI as the number of days between the last farrowing and culling. To determine the effects of farm, litter size at first farrowing (LSF1) and age at first farrowing (AF1) on LPL and NP, and of farm, LSF1 and culling reason on CI general linear models were used. Means and standard errors for LPL, NP, and CI were 496.4 +/- 8.42 days, 3.35 +/- 0.04 parities, and 48.3 +/- 0.52 days, respectively. All factors had significant effects (P < 0.05) on LPL, NP, and CI. The sows from farm 2 stayed longer (806.0 days) and had more parities (5.25) than the sows from the other farms. Sows with the smallest litters (a parts per thousand currency sign8 piglets) at first farrowing stayed the least time in the farm (675.1 days) and had the fewest parities (4.49). Gilts farrowing the first time before 331 days of age stayed longer time in the farm (726.4 days) and had more parities (4.81) in comparison with 331-348 and more than 348 days age groups. With respect to CI, the sows in farm 3 stayed the longest time in the farm. Sows with more than five parities were culled sooner after their last farrowing. In conclusion, differences between farms for LPL, PN, and CI were found. Females that farrowed at a short age and those with large litters stayed longer in the herd. Old sows and those culled for reproductive reasons stayed the least time in the herd after their last farrowing.
机译：本研究的目的是确定某些因素对母猪生产寿命（LPL）的长度，胎次数（NP）和淘汰间隔（CI）的影响。从2003年到2009年，使用了来自墨西哥尤卡坦州四个农场的3,746头具有LPL和NP记录的母猪和5,819根具有CI记录的母猪的信息。 LPL被定义为第一次分娩和淘汰之间的天数，或者CI为最后一次分娩和淘汰之间的天数。为了确定农场的影响，使用了第一胎（LSF1）的产仔数和第一胎（AF1）的年龄对LPL和NP的影响，对猪场而言，使用了LSF1和淘汰原因对CI通用线性模型的影响。 LPL，NP和CI的平均值和标准误分别为496.4 +/- 8.42天，3.35 +/- 0.04个奇偶校验和48.3 +/- 0.52天。所有因素均对LPL，NP和CI有显着影响（P <0.05）。农场2的母猪比其他农场的母猪停留时间更长（806.0天），胎次更多（5.25）。初次分娩时产仔数最小（每千分之八的仔猪）的母猪在农场的停留时间最少（675.1天），胎次最少（4.49）。与331-348岁和348天以上的年龄组相比，第一次在331天龄之前分娩的母猪在农场中的停留时间更长（726.4天），并且有更多的胎次（4.81）。关于CI，农场3中的母猪在农场中的停留时间最长。超过五胎的母猪在最后一次分娩后被较早淘汰。总之，发现了LPL，PN和CI场之间的差异。分娩年龄短的雌性和产仔数大的雌性在畜群中的存活时间更长。在最后一次分娩后，旧母猪和因生殖原因而淘汰的母猪在畜群中停留的时间最少。

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