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Litter characteristics at birth were recorded in 4 genetic types of sows with differing maternal abilities. Eighty-two litters from F 1 Duroc x Large White sows, litters from Large White sows, 63 litters from Meishan sows, and litters from Laconie sows were considered. Statistical models included random effects of sow, litter, or both; fixed effects of sow genetic type, parity, birth assistance, and piglet sex, as well as gestation length, farrowing duration, piglet birth weight, and litter size as linear covariates. The quadratic components of the last 2 factors were also considered. For statistical analyses, GLM were first considered, assuming a binomial distribution of stillbirth.
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Between-breed variability of stillbirth and its relationship with sow and piglet characteristics

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Between-breed variability of stillbirth and its relationship with sow and piglet characteristics

Pen-mating, one of three mating systems available to pork producers, Table 1 is the process of putting boars and females in the same pen for a designated period u sually 21 to 42 days using an unsupervised mating process. Scientific experiments have evaluated the influence of penmating on reproductive performance. Although pen-mating is utilized as a labor-saving strategy for breeding management, farrowing rate number of females farrowed per number of females exposed of females penmated at first estrus after weaning varies substantially Table 2. A comparison between breeding pens in Table 2 cannot be made because of differences in the age of boars, number of boars per pen, and number of sows in each pen.
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Pen-Mating Female Pigs: Problems and Possible Solutions

By John J. McGlone, Edgar O. Jones, Elaina M. Matthews, Amanda A. Gonzalez and Erica Reyes.
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The successful pig farmer always uses good breeding animals. The piglets that are produced must grow fast and produce quality carcasses with a high percentage of meat and a small quantity of fat. Therefore, when you buy breeding animals, make sure that the pigs come from a farm known to have pigs of good quality and where the management and standard of hygiene are excellent.
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