Body composition of gilts at puberty.

Rozeboom, D. W.; Pettigrew, J. E.; Moser, R. L.; Cornelius, S. G.; Kandelgy, S. M. el

doi:10.2527/1995.7392524x

Cited by 34 publications

(47 citation statements)

References 7 publications

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“…AA gilts had lower meat percentage and muscle thickness, higher fat thickness and lower ham width compared with GG gilts (Van den Broeke et al, 2015). Our results are therefore in accordance with the results of Rozeboom et al (1995) and Patterson et al (2002), that is that no association can be found between body conformation and the attainment of puberty in gilts.…”

supporting

confidence: 89%

The effect of the MC4R gene on boar taint compounds, sexual maturity and behaviour in growing-finishing boars and gilts

Broeke¹,

Aluwé²,

Janssens

et al. 2015

Animal

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Societal pressure to ban surgical castration of male piglets is rising due to animal welfare concerns, thus other methods to prevent boar taint need to be explored. Genetic selection against boar taint appears to be a long-term sustainable alternative. However, as boar taint is linked to reproductive hormones, it is important to consider possible negative side effects such as delayed sexual maturity or changes in behaviour. We reported earlier that the melanocortin-4 receptor (MC4R) marker can be used to reduce boar taint levels in fat of boars. The objective of this study was to evaluate whether MC4R marker-assisted selection for lower boar taint prevalence affects plasma levels of boar taint compounds and testosterone; sexual maturity; behaviour; skin lesions; and lameness in boars and gilts. Using an intervention study with a 2 × 2 design, 264 boars and gilts differing on position 893 of the MC4R gene (AA v. GG) were compared. The MC4R polymorphism did not affect the plasma concentration of either androstenone or testosterone at different time points, whereas the concentration of skatole was significantly lower ( P = 0.003) and the concentration of indole tended to be lower ( P = 0.074) in GG compared with AA boars. A higher percentage of gilts of the GG genotype were in puberty at slaughter age compared with AA gilts ( P < 0.001). The age of the boars at sexual maturity (as indicated by the first positive preputial smear test) did not differ between AA and GG boars. In contrast, weight of GG boars at sexual maturity tended to be lower ( P = 0.065). During the period from 6 weeks of age to slaughter, boars and gilts of the GG genotype showed more playing behaviour ( P = 0.015) and less passive and feeding behaviour ( P = 0.003). They showed more skin lesions on their back and caudal area ( P = 0.022), and tended to show more skin lesions on their head and anterior area ( P = 0.093) compared with AA animals. In conclusion, the polymorphism in the MC4R gene can be used as a marker without negative effects on reproduction characteristics in boars and gilts. Genetic selection towards a lower prevalence of boar taint will lead to more active pigs with more skin lesions. Management strategies may therefore be necessary to reduce skin lesions in the selected animals.

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supporting

confidence: 89%

The effect of the MC4R gene on boar taint compounds, sexual maturity and behaviour in growing-finishing boars and gilts

Broeke¹,

Aluwé²,

Janssens

et al. 2015

Animal

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“…Thus, it appears that developing gilts with restricted energy intake reduces age at puberty. However, natural variation in gilt prepubertal ADG within a population does not appear to be related to age at puberty (Rozeboom et al, 1995).…”

Section: Discussionmentioning

confidence: 87%

Effects of restricting energy during the gilt developmental period on growth and reproduction of lines differing in lean growth rate: Responses in feed intake, growth, and age at puberty1

Miller

Moreno

Johnson

2011

Journal of Animal Science

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ABSTRACT:The overall objective was to compare reproductive performance through 4 parities of gilts developed with ad libitum access to feed or with restriction of energy to 75% of ad libitum intake. Effects on growth and pubertal development are reported. The experiment was a 2 × 2 factorial with 661 gilts. One-half of the gilts (n = 330) were allowed ad libitum access to feed from weaning to breeding at 235 d of age (AL), and 331 littermates were developed with ad libitum access to feed to 123 d of age and then restricted to 75% of ad libitum intake to 235 d of age (Res). Diets for gilts on regimen AL were formulated to meet requirements for growth. All nutrients except energy and selenium were increased in the diet fed to gilts on regimen Res so that nutrient intake per unit of BW was expected to be similar to that of gilts on regimen AL. Sires of all gilts were from an industry maternal line. Dams were either an industry Large White-Landrace cross, or Nebraska selection Line 45, producing gilts denoted as LW/LR and L45X, respectively. Traits were recorded every 2 wk. Recording of feed intake and BW began at 53 d of age, and recording of backfat (BF) and LM area (LMA) began at 123 d of age. Estrus detection began at 140 d of age to determine age at puberty (AP). The G:F ratio from 123 to 235 d of age for gilts on the AL regimen was greater (0.269 vs. 0.257, P < 0.01) than for gilts on the Res regimen; the greatest difference occurred in the first 2-wk period following feed restriction. The LW/ LR gilts were heavier, had less BF, and had greater LMA than L45X gilts, but interactions with feeding regimen and period of development existed. Feed restriction reduced BW, BF, LMA, and ratio of BF to BW, but had little effect on ratio of LMA to BW. More L45X gilts than LW/LR gilts (98 vs. 93%, P < 0.01) and more gilts developed on regimen AL than regimen Res (98 vs. 91%, P < 0.01) expressed estrus. Mean age at puberty was 178.6 d for LW/LR and 173.0 d for L45X gilts (P < 0.01) and 174.1 d for regimen AL and 177.5 d for regimen Res (P < 0.05). The Res regimen delayed pubertal development. Subsequently, it will be important to determine effects on reproduction through 4 parities.

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“…In reviewing growth and puberty reports, Rauw et al (1998) noted that gilts with a greater lean percentage had a delayed onset of puberty, and negative genetic correlations have been reported between growth rate and estrus signs at puberty (Rydhmer et al, 1994). Leptin has long been recognized as a putative signal that links metabolic status with the neuroendocrine control of reproduction and puberty in pigs, and attainment of puberty may be related to a metabolic state at a critical period of development rather than a level of body composition (Rozeboom et al, 1995).…”

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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Body composition of gilts at puberty.

Cited by 34 publications

References 7 publications

The effect of the MC4R gene on boar taint compounds, sexual maturity and behaviour in growing-finishing boars and gilts

The effect of the MC4R gene on boar taint compounds, sexual maturity and behaviour in growing-finishing boars and gilts

Effects of restricting energy during the gilt developmental period on growth and reproduction of lines differing in lean growth rate: Responses in feed intake, growth, and age at puberty1

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

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