Factors influencing pre‐ovulatory follicle diameter and weaning‐to‐ovulation interval in spontaneously ovulating sows in tropical environment

Pearodwong, Pachara; Tretipskul, Chanyuth; Panyathong, Raphee; Tummaruk, Padet

doi:10.1111/rda.13836

Cited by 4 publications

(2 citation statements)

References 23 publications

(64 reference statements)

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“…Common features of seasonal heat stress on gilt and sow reproductive performance in tropical countries like Thailand are the same as for temperate regions, including reduced feed intake, alterations in follicular development and the timing of ovulation relative to the detection of estrus, the reduced expression of estrus, prolonged weaning-to-first-service interval, decreased luteal size, compromised embryo development, oocyte quality, and maternal recognition of pregnancy (Bidne et al, 2019;Pearodwong et al, 2019Pearodwong et al, , 2020De Rensis et al, 2017;Tummaruk, 2012;Tummaruk et al, 2004). In the tropics, high temperatures and relative humidity and/or high temperature-humidity index (THI) during gestation significantly reduced farrowing rate (Tummaruk et al, 2010a) and the number of total piglets born per litter (Tummaruk et al, 2010b).…”

Section: Typical Climatic Aspects Of a Tropical Environmentmentioning

confidence: 99%

“…In general, sow backfat thickness, body condition score and body weight are positively associated. These parameters are used in practice as indicators for sow nutritional status during their reproductive cycles (Pearodwong et al, 2020). Poor feed intake or inadequate nutritional supply in gestating sows may increase the production of reactive oxygen species causing increased oxidative stress (Berchieri-Ronchi et al, 2011).…”

Section: Gestation and Lactation Managementmentioning

confidence: 99%

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Managing prolific sows in tropical environments

Tummaruk

Rensis

Kirkwood

2022

Molecular Reproduction Devel

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Litter size in modern sows has been dramatically improved in recent decades by genetic selection for highly prolific sows. In a tropical environment, the average total number of pigs born and number born alive are reported to be as high as 17.2 and 15.1 piglets per litter, respectively. Therefore, the new production target in many herds aims to achieve 30–40 pigs weaned per sow per year. Despite the improvements in litter size, the mean preweaning piglet mortality rate remains high, at between 10% and 20%, in major pig‐producing countries. A sufficient daily feed intake by lactating sows is important for high milk production as sow milk yield is the limiting factor for piglet growth rate. Heat stress, which can occur when the ambient temperatures rise above 25°C, is one of the major problems that decreases daily feed intake and compromises milk yield. Therefore, it is necessary to encourage high feed intakes to achieve high milk yields. However, even with high nutrient intakes, productivity can be constrained by intestinal barrier function, limiting digestive ability, and allowing potential pathogens and/or toxins to become systemic. This is more likely greater under tropical conditions because of heat stress, exacerbating sow fertility problems. Underpinning sow herd performance, including responses to environmental challenges, is the selection of appropriate gilts, for example, selection and management for early puberty, thus presumably selecting the more fertile gilts and the correct management of lactation to improve the number of weaned piglets are some of the key factors for future reproductive efficiency of the farm under tropical conditions.

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