Environmental and genetic factors affecting the weaning-estrus interval in sows

Leite, Carla Daniela Suguimoto; Lui, Jeffrey Frederico; Albuquerque, Lúcia Galvão de; Alves, D. N. M.

doi:10.4238/2011.november.4.2

Cited by 11 publications

(14 citation statements)

References 22 publications

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“…The results obtained showed a tendency to prolong the duration of the weaning-to-conception interval in the animals on I st parity. The same trend was also found by other authors (19,20). The probable reason for this is that sows with I st -II nd farrowing have relatively higher nutritional requirements for their growth (since they have not yet reached the optimum body weight), and, on the other hand, have limited body reserves of protein and fat.…”

Section: Discussionsupporting

confidence: 87%

The Еffect of Season and Parity on the Reproductive Performance of Sows

Dimitrov

Hristova

Kochoski

et al. 2018

Macedonian Veterinary Review

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The aim of this study was to analyze the effect of season and number of parity on the reproductive performance of sows kept on a commercial farm. To achieve this objective, 800 nrs productive parent sows and a total of 958 parities were analyzed. The results show that sow’s breeding season had a significant effect on the weaning-to-oestrus interval, the farrowing rate, the litter size and weaning piglets with positive results during autumn, winter and spring seasons. The number of parity has a significant effect on the weaning-to-oestrus interval, litter size and weaning piglets with acceptable values in sows with more farrowing. The results of this study on a pig farm with analysis which highlights the risk factors associated with reproductive performance of sows, could be used to improve sow farm practices.

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Section: Discussionsupporting

confidence: 87%

The Еffect of Season and Parity on the Reproductive Performance of Sows

Dimitrov

Hristova

Kochoski

et al. 2018

Macedonian Veterinary Review

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“…All the sows with corpora lutea at weaning were registered during the WS period. The more comfortable environmental conditions in WS, characterized by milder air temperatures and less daylight, promotes satisfactory feed intake during lactation and thus the possible reversion or attenuation of some the aforementioned inhibitory factors [20]. Ovulation during the lactation period is an important reason to explain the delay in onset of estrus experienced by some weaned sows [21].…”

Section: Discussionmentioning

confidence: 99%

“…Those with lower parity had smaller ovarian follicles at weaning than those with higher parity. It is well-known that gilts and primiparous sows have more limited capacity for feed conversion and are more likely to be catabolic at lactation [20,32]. Moreover, sows continue with both limited intake capacity and high energy demand until they reach full body weight, which usually occurs after the third pregnancy.…”

Section: Discussionmentioning

confidence: 99%

Ovarian Follicle Growth during Lactation Determines the Reproductive Performance of Weaned Sows

Lopes

Padilla

Bolarín³

et al. 2020

Animals

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Factors causing variability in ovarian follicle size among weaned sows are not well known. This field study aimed to disclose influencing factors and evaluate if the differences at weaning were established during lactation. Ovaries were scanned using transrectal ultrasound. The first experiment was conducted over a year with 191 randomly chosen sows that were hierarchically grouped (p < 0.001) according to ovarian follicle diameter reached at weaning: Small (0.20–0.30 cm; n = 37), medium (0.31–0.39 cm; n = 75), and large (0.40-1.00 cm; n = 69). Sows with small follicles showed a higher incidence of post-weaning anestrus (p < 0.01), longer wean-to-estrus/ovulation intervals (p < 0.01) and farrowing smaller litters (p < 0.05). Ovaries with small follicles were more common among sows weaned in summer–autumn than in winter–spring (p < 0.01) and among sows of lower parity (1–3) (p < 0.05). In the second experiment, with 40 sows randomly chosen at farrowing, the ovaries were scanned at 7, 14, and 21 d post-partum. Sows showed great variability in ovarian follicular size during lactation with a consistent relationship between the three measurement times (r = 0.84, p < 0.01). Follicle size was smaller in sows nursing in summer–autumn than in winter–spring (p < 0.05). In conclusion, early lactation dictates the great variability in ovarian follicular diameter at weaning shown by sows. Sows with smaller follicles at weaning had longer intervals for estrus and ovulation and smaller litters at farrowing and they were in greater numbers among sows weaned during the summer and fall and among those with fewer previous farrowing.

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“…Knowledge of the influence of environmental and genetic factors on these traits is becoming increasingly important (Cavalcante-Neto et al, 2009a;Leite et al, 2011), considering the geographic dimensions of Brazil, with regions of different climates, not to mention deficient management, inadequate facilities, and animals that are not always of high breeding value (Pinheiro et al, 2000;Cavalcante-Neto et al, 2008a, 2009b.…”

Section: Introductionmentioning

confidence: 99%

Genetic and environmental effects on age at first farrowing in sows in southeastern Brazil

Cavalcante-Neto¹,

Lui²,

Sarmento³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. We evaluated genetic and environmental factors affecting age at first farrowing of sows in the Brazilian southeast. For this purpose, 466 observations regarding the age at first farrowing were made for Dalland-C40 © animals belonging to two herds. The effects of the environmental factors on this trait were assessed by means of a model that included, as random effects, the influence of the sow's father and mother and, as fixed effects, the influence the year of birth, the herd and the birth season, along with the covariable litter size at birth. The variance components were estimated using the derivative-free restricted maximum likelihood method. The estimated mean was 354.8 ± 25.87 days, with a coefficient of variation of 7.29%. Significant effects on the trait were observed for the herd, the year and the season of birth; Genetic and environment effects on age at first farrowing but a linear effect of litter size at birth on the age at first farrowing was not observed. The boar did not significantly contribute to the variation occurring among the sows, whereas the sow's mother caused significant variation. The heritability estimate for the age at first farrowing was 0.44 ± 0.15, which is considered high. We concluded that herd effect and year and season of birth should be taken into consideration for an accurate genetic comparison; consequently, the animals should be joined into contemporary groups.

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Environmental and genetic factors affecting the weaning-estrus interval in sows

Cited by 11 publications

References 22 publications

The Еffect of Season and Parity on the Reproductive Performance of Sows

The Еffect of Season and Parity on the Reproductive Performance of Sows

Ovarian Follicle Growth during Lactation Determines the Reproductive Performance of Weaned Sows

Genetic and environmental effects on age at first farrowing in sows in southeastern Brazil

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