Effect of body composition at selection on reproductive development in large white gilts.

Gaughan, J. B.; Cameron, R. D. A.; Dryden, G. McL.; Young, Bruce A.

doi:10.2527/1997.7571764x

Cited by 36 publications

(34 citation statements)

References 30 publications

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“…It has been postulated that a certain level of body condition is necessary for puberty attainment in gilts (Gaughan et al, 1997), whereas dietary treatments do not seem to affect pubertal age (Patterson et al, 2002). However, gilts with greater growth rate and backfat have shorter weaning to estrus intervals (Tummaruk et al, 2001) and age at puberty is positively genetically correlated with weaning to estrus interval and signs of estrus (Sterning et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Genetic relationships of body composition, serum leptin, and age at puberty in gilts12

Kuehn

Nonneman

Klindt

et al. 2009

Journal of Animal Science

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Section: Discussionmentioning

confidence: 99%

Genetic relationships of body composition, serum leptin, and age at puberty in gilts12

Kuehn

Nonneman

Klindt

et al. 2009

Journal of Animal Science

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“…The level of protein deposition is considered to be the regulator of reproduction functions in gilts. Gaughan et al (1997) reported that the level of fat and protein deposition was bound to the physiology of sexual maturity and it was considered to be a more important determinant for achieving puberty than age and weight. Čeřovský (2001), Bečková and Daněk (2002), Čechová and Tvrdoň (2002) found out a positive influence of gain on reproduction ability.…”

mentioning

confidence: 99%

Influence of growth rate, backfat thickness and meatiness on reproduction efficiency in Landrace gilts

Bečková¹,

Rozkot²

2005

CZECH J ANIM SCI

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ABSTRACT:In the nucleus herd and subsequent multiplication herd of the Landrace (L) breed in 262 gilts farrowed after the first insemination we analysed the influence of various levels of average daily weight gain from birth in the performance test in the field (ADG1) and till mating (ADG2), average backfat thickness (mm) in the performance test (BF1) and at mating (BF2) or lean meat percentage (LM1 and LM2) on the age and weight at mating and at farrowing, on the number of piglets born, piglets born alive and weaned ones and litter weight at 21 days. Based on the studied traits the gilts were divided into intervals for the evaluation according to the average and standard deviation (≤ x -s; x -s; x + s; ≥ x + s). A significant influence of ADG1 and ADG2 on the weight at the first insemination was observed (P < 0.01, P < 0.001). The age and weight after farrowing were affected by ADG1 to a greater extent (P < 0.001). With increasing values of weight gain a higher number of piglets per litter was observed. ADG1 affected the number of piglets born and also of piglets born alive (P < 0.001), the litter weight at 21 days (sows' milk production) and the number of weaned piglets (P < 0.05). ADG2, however, affected only the number of piglets born and of piglets born alive per litter (P < 0.05, P < 0.001). BF1 affected only the age at the first insemination or at farrowing (P < 0.05) and the number of piglets at the age of 21 days (P < 0.05). BF2 affected the number of piglets born, those born alive and the weaned ones (P < 0.05, P < 0.01), the litter weight at 21 days (P < 0.001) and the number of piglets at 21 days (P < 0.05, P < 0.01). The lean meat percentage ascertained in the performance test (LM1) did not significantly affect any studied reproduction trait. A significant influence of LM2 on the age at the first insemination or at farrowing was proved (P < 0.05, P < 0.01) as well as on the weight at the first fertile insemination (P < 0.001). An increased percentage of lean meat had a negative impact on the number of piglets born and piglets born alive (P < 0.05), on litter weight at 21 days (P < 0.01), number of piglets at the age of 21 days (P < 0.001) and on the number of weaned piglets (P < 0.05, P < 0.01). A more significant influence of the higher growth ability of gilts on the reproductive traits was detected in the performance test. On the contrary, at the period of mating the reproductive traits were affected by backfat thickness and meatiness to a greater extent.

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“…Vários autores sugerem que animais selecionados para maior deposição de tecido magro podem apresentar maturação reprodutiva mais tardia (Gaughan et al, 1997;Evans & O'Doherty, 2001;Wettere et al, 2006). É provável que o genótipo usado no presente estudo tenha maturação fisiológica do eixo-hipotálamo-hipófise-gônadas mais tardia do que outros genótipos modernos, o que explicaria os baixos percentuais de manifestação da puberdade observados nas leitoas estimuladas aos 150 e 170 dias de idade.…”

Section: Resultsunclassified

Indução de puberdade em leitoas com diferentes idades em dois sistemas de manejo

Ribeiro

Magnabosco

Bierhals

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar o efeito do método de exposição ao macho e da idade da leitoa, por ocasião da exposição, sobre o percentual de manifestação do primeiro estro, idade de início da puberdade e intervalo entre estímulo e puberdade. Leitoas Danbred F1 Landrace x Large White foram induzidas à puberdade com dois sistemas de exposição ao macho -Baia, estímulo feito pela introdução de macho na baia das fêmeas; Bear, estímulo feito pela colocação de fêmeas na área de permanência de machos -, em três idades de início do estímulo -150, 170 e 200 dias. Não houve diferença entre os sistemas de estimulação quanto à percentagem de leitoas em estro, idade à puberdade e intervalo entre estimulação e puberdade. Esse intervalo foi menor, quando a exposição das fêmeas foi feita aos 200 dias de idade, e a proporção de fêmeas que atingiram a puberdade aos 10, 20, 30 e 42 dias após o início da exposição foi maior. A indução da puberdade tem maior sucesso quando a exposição da fêmea ao macho é feita aos 200 dias de idade, independentemente do sistema de estimulação.Termos para indexação: estimulação à puberdade, idade ao primeiro estro, nulípara. Puberty induction in gilts at different ages in two management systemsAbstract -The objective of this work was to determine the effect of boar-exposure method and of gilt age at exposure on the percentage of first estrus manifestation, puberty age, and interval between stimulus and puberty. Danbred F1 Landrace x Large White gilts were induced to puberty with two different systems of boar exposure -Baia, stimuli done by putting a male inside the pens of gilts; Bear, stimuli done by putting the females in an area with males -, and three ages at the beginning of stimulation -150, 170 and 200 days. There was no difference between the stimulation systems for the percentage of gilts in estrus, puberty age, and the interval between stimulation and estrus onset. This interval was lower when stimulus started at 200 days, and the proportion of gilts which reached puberty at 10, 20, 30 and 42 days after the beginning of boar-exposure was higher. Puberty induction has higher success when the female exposure to the male is done at 200 days, regardless of the boar-exposure system.

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Effect of body composition at selection on reproductive development in large white gilts.

Cited by 36 publications

References 30 publications

Genetic relationships of body composition, serum leptin, and age at puberty in gilts12

Genetic relationships of body composition, serum leptin, and age at puberty in gilts12

Influence of growth rate, backfat thickness and meatiness on reproduction efficiency in Landrace gilts

Indução de puberdade em leitoas com diferentes idades em dois sistemas de manejo

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