Variations in maternal nutrition during gestation can influence fetal growth, fetal development and permanently 'programme' offspring for postnatal life. The objective of this study was to analyze the effect of increased maternal nutrition during different gestation time windows on offspring growth, carcass and meat quality and gene expression in skeletal muscle. A total of 64 sows were assigned to the following feeding treatments: a standard control diet at a feed allocation of 2.3 kg/day throughout gestation increased feed allowance of 4.6 kg/day from 25 to 50 days of gestation (dg), from 50 to 80 dg and from 25 to 80 dg. At weaning, light, medium and heavy pigs of the same gender, within litter, were selected based on birth weights, individually penned and monitored until slaughter at 130 days post weaning. Carcass and meat quality traits of the semimembranosus (SM) muscle were recorded post mortem. A cross section of the semitendinosus (ST) muscle encompassing the deep and superficial regions were harvested from pigs (n = 18 per treatment) for RNA extraction and quantification of gene expression by real-time PCR.
The results showed that doubling the feed intake from 25 to 50 dg reduced offspring growth, carcass weight, intramuscular fat content and increased drip loss of the SM muscle. On the other hand, protein phosphatase 3 catalytic subunit - α-isoform, which codes for the transcription factor calcineurin, was upregulated in the ST muscle of offspring whose mothers received increased feed allowance from 25 to 50 dg. This may provide an explanation for the previous observed increases in Type IIa muscle fibres of these offspring. Increasing the maternal feed intake from 50 to 80 dg negatively impacted pig growth and carcass weight, but produced leaner male pigs. Extending the increased maternal feed intake from 25 to 80 dg had no effect on offspring over the standard control gestation diet. Although intra-litter variation in pig weight is a problem for pig producers, increased maternal feeding offered no improvement throughout life to the lighter birth weight littermates in our study.
Indeed, increased maternal nutrition at the three-gestation time windows selected provided no major benefits to the offspring.
- Limited and excess protein intake of pregnant gilts affects body composition and newborn and weanling development in piglets 11-Oct-2012 (1 years 9 months 18 days ago)
- Optimizing individual and group housing systems based on indicators of sow well-being 20-Sep-2012 (1 years 10 months 9 days ago)
- Limited and excess dietary protein during gestation affects growth and compositional traits in gilts and impairs offspring fetal growth 05-May-2011 (3 years 2 months 24 days ago)
- Effect of type and timing of oil supplements to sows during pregnancy on the growth performance and endocrine profile of low and normal birth weight offspring 07-May-2009 (5 years 2 months 22 days ago)
This area is not intended to be a place to consult authors about their articles, but rather a place for open discussion among pig333.com users.