Feeding lactating primiparous sows to establish three divergent metabolic states: I. Associated endocrine changes and postweaning reproductive performance.

Zak, L.J.; Williams, Ian H.; Foxcroft, G. R.; Pluske, J.R.; Cegielski, A.; Clowes, E. J.; Aherne, F. X.

doi:10.2527/1998.7641145x

Cited by 55 publications

(38 citation statements)

References 36 publications

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“…Higher plasma IGF-I concentrations in sows fed the High feeding level during lactation are in agreement with previous results [10,13,24]. Even a restricted feed intake during one week of lactation resulted in a decrease of IGF-I concentration [23], suggesting a rapid effect of feed intake on IGF-I concentration.…”

Section: Discussionsupporting

confidence: 81%

In primiparous sows, plasma insulin-like growth factor-I can be affected by lactational feed intake and dietary energy source and is associated with luteinizing hormone

et al. 2001

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-During a 21-day lactation period, 48 primiparous sows were fed a fat-or a starch-rich diet (131 g fat and 183 g starch + sugar . kg -1 vs. 31 g fat and 351 g starch + sugar . kg -1 ) at a high or a low level of feeding (44 vs. 33 MJ net energy per day) according to a factorial design. Blood samples were collected at days 7, 14, 21, 22 (weaning), 24, 25, 26, and 27 post-partum (p.p.). IGF-I levels were higher with the starch-rich than with the fat-rich diet at days 7, 21, 22, and 24 p.p. Plasma IGF-I concentrations on day 22 p.p. were positively related with LH pulse frequency on day 22 p.p. and the height of the pre-ovulatory LH surge. Sows with low body weight at farrowing and high lactational body weight loss had lower plasma IGF-I concentrations than others, before and after weaning. These results indicate that IGF-I concentrations are affected by both feeding level and dietary energy source and are related to the secretion of LH. Furthermore, body weight at farrowing interacts with lactational body weight loss to affect IGF-I concentrations. IGF-I / sow / lactation / LH / energyRésumé -Chez les truies primipares, l'IGF-I plasmatique peut être influencé par le niveau alimentaire de lactation et la source d'énergie, et est associé à la sécrétion de LH. Pendant 21 jours de lactation, 48 truies primipares reçoivent un aliment enrichi en graisse ou en amidon (131 g graisse et 183 g amidon + sucre . kg -1 versus 31 g graisse et 351 g amidon + sucre . kg -1 ) sous deux niveaux éner-gétiques (44 versus 33 MJ énergie nette par jour) selon un schéma factoriel. Des prises de sang ont Reprod. Nutr. Dev. 41 (2001) 27-39 27

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Section: Discussionsupporting

confidence: 81%

In primiparous sows, plasma insulin-like growth factor-I can be affected by lactational feed intake and dietary energy source and is associated with luteinizing hormone

et al. 2001

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“…The experimental design, housing conditions, and management of gilts during lactation and gestation are described in Zak et al (1998).…”

Section: Methodsmentioning

confidence: 99%

Feeding lactating primiparous sows to establish three divergent metabolic states: II. Effect on nitrogen partitioning and skeletal muscle composition.

Clowes

Williams

Baracos

et al. 1998

Journal of Animal Science

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“…However, this mobilization reduces the nutritional requirements due to tissue contribution. Although a little catabolism may affect positively the LH secretion, this does not minimize the negative lactation effect on post-weaning fertility (Zak et al, 1998). The excessive body fat and protein reserves lost during lactation can also impair the subsequent reproductive performance (Close and Cole, 2000).…”

Section: Introductionmentioning

confidence: 99%

Lysine and metabolyzable energy requirements of lactating sows for subsequent reproductive performance

Santos

Moreira

Martins

2006

Braz. arch. biol. technol.

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The requirements of lactating sows for total lysine and metabolyzable energy (ME) to support subsequent reproduction performance were evaluated. One hundred and twenty sows were used. The treatments were constituted of eight diets (factorial arrangement of four levels of total lysine: 0.75, 0.90, 1.05 and 1.20%, and two levels of ME: 3,250 and 3,400 kcal ME/kg). There was interaction between lysine and ME on the plasma urea nitrogen (PUN), with linear decrease effect on level of 3,250 kcal ME/kg, and quadratic effect on level of 3,400 kcal ME/kg, with the lowest level of PUN with 1.06% lysine. The reproductive performance in the subsequent farrowing was not affected by the lysine levels and ME, hence, neither the total born nor the born alive differed among the treatments. There was no convincing information to support that the requirements of total lysine and ME for lactating sows were higher than 0. 75% and 3,250 kcal/kg.

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Feeding lactating primiparous sows to establish three divergent metabolic states: I. Associated endocrine changes and postweaning reproductive performance.

Cited by 55 publications

References 36 publications

In primiparous sows, plasma insulin-like growth factor-I can be affected by lactational feed intake and dietary energy source and is associated with luteinizing hormone

In primiparous sows, plasma insulin-like growth factor-I can be affected by lactational feed intake and dietary energy source and is associated with luteinizing hormone

Feeding lactating primiparous sows to establish three divergent metabolic states: II. Effect on nitrogen partitioning and skeletal muscle composition.

Lysine and metabolyzable energy requirements of lactating sows for subsequent reproductive performance

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