Some Factors Affecting Pig Survival1

Bereskin, B.; Shelby, C. E.; Cox, D. F.

doi:10.2527/jas1973.365821x

Cited by 62 publications

(33 citation statements)

References 4 publications

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“…There are reports of large differences in serum T concentrations between newborn male and female rats (Slob et al 1980) which are consistent with the higher T levels of the male piglets after birth. Collu et al (1984) Bate and Hacker (1982) and is consistent with the finding of Bereskin et al (1973) …”

supporting

confidence: 92%

The Relationship Between Serum Testosterone Levels, Sex and Teat-Seeking Ability of Newborn Piglets

Bate¹,

Hacker²,

Kreukniet³

1985

Can. J. Anim. Sci.

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. 1985. The relationship between serum testosterone levels, sex and teat-seeking ability of newborn piglets. Can. J. Anim. Blood samples were collected from five pregnant sows from day 1l l postbreeding to farrowing and from their piglets at regular intervals between birth and 48 h. The time between birth and first suckling (BTS) was recorded for each piglet. Maternal serum testosterone (T) levels were detectable only at the beginning of parturition and were highly correlated (r:0.83) with litter BTS. Serum T levels of male and female piglets were similar at birth. In male piglets the T levels increased to a peak 2h after birth and decreased gradually thereafter. In contrast, the T levels of female piglets declined rapidly after birth to baseline levels. The BTS of female piglets was shorter than that of male piglets. Body weight of males was higher than that of females and was influenced by litter size. These results suggest that the higher serum T levels of male piglets may have a detrimental effect on their teat-seeking ability. For personal use only.

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supporting

confidence: 92%

The Relationship Between Serum Testosterone Levels, Sex and Teat-Seeking Ability of Newborn Piglets

Bate¹,

Hacker²,

Kreukniet³

1985

Can. J. Anim. Sci.

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“…Approximately 15%-20% of piglets born do not survive to weaning (Fahmy and Bernard, 1971;Quiniou et al, 2002), and low birth weight is a primary contributor to poor survival to weaning (Winters et al, 1947;Pomeroy, 1960;Sharpe, 1966;Fahmy and Bernard, 1971;Bereskin et al, 1973;Pettigrew et al, 1986). Pre-weaning survival of piglets lighter than 0.45 kg was significantly lower than that of piglets weighing 1.6 kg or more (18% vs. 97%) (Fahmy and Bernard, 1971).…”

Section: Pre-weaning Mortalitymentioning

confidence: 98%

Within-litter variation in birth weight: impact of nutritional status in the sow

Yuan

Zhu

Shi

et al. 2015

J. Zhejiang Univ. Sci. B

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Accompanying the beneficial improvement in litter size from genetic selection for high-prolificacy sows, within-litter variation in birth weight has increased with detrimental effects on post-natal growth and survival due to an increase in the proportion of piglets with low birth-weight. Causes of within-litter variation in birth weight include breed characteristics that affect uterine space, ovulation rate, degree of maturation of oocytes, duration of time required for ovulation, interval between ovulation and fertilization, uterine capacity for implantation and placentation, size and efficiency of placental transport of nutrients, communication between conceptus/fetus and maternal systems, as well as nutritional status and environmental influences during gestation. Because these factors contribute to within-litter variation in birth weight, nutritional status of the sow to improve fetal-placental development must focus on the following three important stages in the reproductive cycle: pre-mating or weaning to estrus, early gestation and late gestation. The goal is to increase the homogeneity of development of oocytes and conceptuses, decrease variations in conceptus development during implantation and placentation, and improve birth weights of newborn piglets. Though some progress has been made in nutritional regulation of within-litter variation in the birth weight of piglets, additional studies, with a focus on and insights into molecular mechanisms of reproductive physiology from the aspects of maternal growth and offspring development, as well as their regulation by nutrients provided to the sow, are urgently needed.

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“…Bereskin et al, 1973;Arango et al, 2006) it is known that piglet's sex affects its birth weight. Thus, we have to consider the difference in mean birth weight of male and female piglets.…”

Section: Datamentioning

confidence: 99%

Comparison of statistical models to analyse the genetic effect on within-litter variance in pigs

Wittenburg

Guiard

Teuscher

et al. 2008

Animal

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Genetics affects not only the weight of piglets at birth but also the variability of birth weight within litter. Previous studies on this topic assigned the sample standard deviation of piglet birth weights within litter as an observation to the sow. However, the contribution of the difference in mean birth weight per sex on the within-litter variance has been neglected so far. This work deals with the genetic effect on within-litter variance when different statistical models with different distributional assumptions are used and considers the sex effect and appropriate weights per trait. Traits were formed from the pooled sample variance of male and female birth weights within litter. A linear model approach was fitted to the logarithmized within-litter variance and the sample standard deviation. A generalized linear model with gamma-distributed residuals and log-link function was applied to the untransformed sample variance. Models were compared by analysing data from 9439 litters from Landrace and Large White of a commercial breeding programme. The estimates of heritability for different traits ranged from 7% to 11%. Although the generalized linear mixed model is preferred from a mathematical view, the rank correlations between breeding values of the linear mixed models and the generalized linear mixed model were relatively high, i.e. 94% to 98%. By residual diagnostics, a linear mixed model using the weighted and pooled within-litter standard deviation was identified as most suitable.

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Some Factors Affecting Pig Survival1

Cited by 62 publications

References 4 publications

The Relationship Between Serum Testosterone Levels, Sex and Teat-Seeking Ability of Newborn Piglets

The Relationship Between Serum Testosterone Levels, Sex and Teat-Seeking Ability of Newborn Piglets

Within-litter variation in birth weight: impact of nutritional status in the sow

Comparison of statistical models to analyse the genetic effect on within-litter variance in pigs

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