Pattern of feed intake and associated metabolic and endocrine changes differentially affect postweaning fertility in primiparous lactating sows.

Zak, L.J.; Cosgrove, John R.; Aherne, F. X.; Foxcroft, G. R.

doi:10.2527/1997.751208x

Cited by 152 publications

(147 citation statements)

References 25 publications

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“…The decline in plasma insulin concentrations which is consistent with previous studies in prepubertal gilts [3,6] and in lactating sows [12,27,38], probably allows the restricted gilts to maintain their glycemia. The decrease in plasma leptin concentrations in response to feed restriction…”

Section: Discussionsupporting

confidence: 80%

GH and IGF-I binding sites in adipose tissue, liver, skeletal muscle and ovaries of feed-restricted gilts

2000

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-The influence of feed restriction on GH and IGF-I binding was examined in the cyclic gilt. IGF-I, IGFBPs, insulin and leptin levels in plasma were also measured. Twenty-four gilts whose oestrous cycle was synchronised were used. From day 3 to day 12, (with day 0 being the first day of oestrus) feed allowance was 240% and 80% of the energy requirements for maintenance for well-fed (H) and restricted gilts (L) respectively. Six gilts in each group were treated with an antagonist of GnRH but the treatment had no effect on any reported measurements. Blood and tissue samples were collected on days 12 and 13 respectively. L gilts lost live weight whereas H gilts gained weight. Plasma IGF-I, insulin and leptin concentrations were lower in L than in H gilts whereas plasma IGFBP levels were not affected by feed restriction. The specific binding of 125 I-bGH to adipose tissue, liver, skeletal muscle and ovary membranes did not differ significantly between H and L gilts. Specific binding of 125 I-IGF-I to hepatic membranes was higher in L than in H gilts whereas it did not differ between the two groups in the other tissue membranes.

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Section: Discussionsupporting

confidence: 80%

GH and IGF-I binding sites in adipose tissue, liver, skeletal muscle and ovaries of feed-restricted gilts

2000

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“…According to Foxcroft et al (2009), the mechanisms affecting fertility may involve hormonal changes, as well as epigenetic changes and/or changes in the expression of genes related to embryo development. Sows under severe catabolism present reduced IGF-1 levels (Patterson et al, 2011), inducing the mobilization of endogenous protein (Zak et al, 1997). Protein mass losses >12% during lactation may reduce follicle number and diameter, and decrease IGF-1 levels in sows submitted to dietary protein restriction during lactation (Clowes et al, 2003a and2003b).…”

Section: Discussionmentioning

confidence: 99%

Impact of feed restriction on the performance of highly prolific lactating sows and its effect on the subsequent lactation

Bettio

Maiorka

Barrilli

et al. 2016

Animal

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A total of 50 mixed parity sows of a high-prolificacy genetic line were used to evaluate the impact of feed restriction during lactation on their production and reproductive performance and their performance in the subsequent lactation. From day 7 of lactation, sows were distributed according to a completely randomized experimental design into two treatments. In treatment 1, sows were fed 8.0 kg feed/day (control) and in treatment 2, sows were fed 4.0 kg/day. The same suckling pressure was maintained until weaning on day 28 of lactation. Average minimum and maximum temperatures measured during the experimental period were 32.1°C and 16.5°C, respectively. Control sows presented significantly higher feed intake (P<0.001) compared with the restricted sows (6.43 v. 4.14 kg/day, respectively). Treatments influenced BW and backfat thickness losses (P<0.001). Control sows lost less BW than the restricted-fed sows (7.8 v. 28.2 kg). Restricted-fed sows lost more backfat thickness than those in the control group (3.97 v. 2.07 mm; P<0.01). Restricted-fed sows tended (P<0.10) to be lighter at weaning compared with the control sows (211 v. 227 kg). The composition of BW loss was influenced by the treatments (P<0.001), as the restricted-fed sows lost more body protein, lipids and energy compared with the control sows (3.90 v. 0.98 kg, 11.78 v. 4.83 kg and 584 v. 224 MJ, respectively). Litter weight gain was greater (P<0.05) in control sows than in restricted-fed sows (2.70 v. 2.43 kg/day). Daily milk production was 19% higher (P<0.01) in the control sows compared with the restricted-fed sows (8.33 v. 6.99 kg/day). However, restricted-fed sows presented a higher (P<0.05) lactation efficiency than the sows of the control group (82.30% v. 72.93%). No differences were detected (P>0.10) in weaning-to-estrus interval and averaged 4.3 days. No effect of the treatment (P>0.10) was observed on any of the studied performance traits in the subsequent lactation, except for litter size at birth that tended (15.2 v. 14.1; P<0.10) to be lower for the restricted sows. In conclusion, the present study demonstrated that feed restriction during lactation leads to intense catabolism of the body tissues of sows, negatively affecting their milk production, and the litter weight gain and possibly number of piglets born in the next litter. On the other hand, restricted-fed sows are more efficient, producing more milk per amount of feed intake.

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“…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. The role of dietary 34 Table III.…”

Section: Discussionmentioning

confidence: 99%

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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Pattern of feed intake and associated metabolic and endocrine changes differentially affect postweaning fertility in primiparous lactating sows.

Cited by 152 publications

References 25 publications

GH and IGF-I binding sites in adipose tissue, liver, skeletal muscle and ovaries of feed-restricted gilts

GH and IGF-I binding sites in adipose tissue, liver, skeletal muscle and ovaries of feed-restricted gilts

Impact of feed restriction on the performance of highly prolific lactating sows and its effect on the subsequent lactation

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

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