Abstract
Abstract The aim of the study was a search for new polymorphisms in the genes related to lactogenesis, including lactose synthesis in colostrum and milk, and determine their relationship with the content of colostrum and milk components and body weight of the piglets. Colostrum and milk were sampled during the second lactation on d 1, 7, 14 and 21 from 112 sows of Polish Large White (PLW) and Polish Landrace (PL). The piglets’ rearing performance was determined based on the number and body weight at 1, 7, 14 and 21 d of age. In the study six polymorphisms located in different genes were analysed. Among the six polymorphisms under analysis, those identified in the B4GALT1 genes had the most significant effect on colostrum and milk composition and the piglets’ body weight changes. Sows of the B4GALT1GG genotype, when compared to those of B4GALT1AA , produced colostrum and milk with a significantly lower lactose content and reared piglets with a substantially higher body weight (by 0.30 kg) at 21 d of age.
Highlights
The role and importance of colostrum and milk as the first and only nourishment during the first weeks of piglet life is well known and has been demonstrated in many studies (Szyndler-Nędza et al, 2013 a; Picone et al, 2018; Zhang et al, 2018 a; Szyndler-Nędza et al, 2020)
Studies aimed at determining the effect of single polymorphisms (SNPs) in maternal genotype on colostrum, milk composition, and growth parameters of reared piglets demonstrated that the polymorphisms of genes related to feeding intake (MC4R), triglyceride synthesis (DGAT1) and fatness of sows (LEPR) influence the content of colostrum and milk components, but do not affect rearing performance of the piglets (Szyndler-Nędza and Ropka-Molik, 2015, Szyndler-Nędza and Piórkowska, 2015)
The Polish Large White (PLW) and Polish Landrace (PL) sows were analysed for polymorphism in the growth hormone (GH) gene (G316A FoKI) according to da Faria et al (2006), and five polymorphisms were identified in the B4GALT1, insulin receptor (INSR), progesterone receptor (PGR) and HSD11β2 genes
Summary
The role and importance of colostrum and milk as the first and only nourishment during the first weeks of piglet life is well known and has been demonstrated in many studies (Szyndler-Nędza et al, 2013 a; Picone et al, 2018; Zhang et al, 2018 a; Szyndler-Nędza et al, 2020). The same authors reported that sows producing low-lactose colostrum within 1 h of farrowing, compared to those producing colostrum high in lactose, reared significantly heavier piglets, by 100 g on d 7 of lactation and by 130 g on d 21. These findings motivated a search for new polymorphisms in the genes related to lactogenesis, including lactose synthesis in colostrum. The aim of the study was to determine the relationship between the polymorphism of beta 1,4-galactosyltransferase-I (B4GALT1), insulin receptor (INSR), 11-beta-hydroxysteroid dehydrogenase (HSD11β2), progesterone receptor (PGR) and growth hormone (GH) (G316A FoKI) genes and the content of colostrum and milk components, sow milk yield, and the body weight of their piglets
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