Abstract
Simple SummaryHigh meat quality is one of the demands made by consumers. Therefore, studies have concluded that meat quality can be improved through some feed additives to broiler diets. Other studies showed that broilers meat quality improved by adding some nutrients to the maternal diet, so this study was conducted to evaluate the paternal effects of dietary 0.1% methionine on meat quality and carcass traits of offspring. Our results suggested that paternal dietary supplementation with 0.1% methionine enhances offspring carcass eviscerated yield, thigh muscles yield and reduces abdominal fat, also meat shear force, drip loss, pH-value, and color. The expression of genes associated with meat quality support these results.The effects that maternal dietary methionine have on progeny have been reported on broilers. However, the paternal effects are not known, so the current study was conducted to explore the influences of paternal dietary methionine (Met) have on progeny carcass traits, meat quality, and related gene expressions. A total of 192 hens and 24 roosters from Ross parent stock at 36 weeks of age were selected. From week 37 to 46, the roosters were allocated to two groups with three replicates of 4 cocks each, (control, 0.28% Met), and methionine group (MET group, 0.28% Met + 0.1% coated Met). The results revealed that, although the heavier live body weight in progeny at day 49 of control group compared to MET group (p < 0.05), the relative eviscerated yield and relative thigh muscle yield were higher in MET group (p < 0.05); but the relative abdominal fat was lower (p < 0.05). In thigh and breast muscles, a positive response of pH24 h value, shear force (g) and drip loss (%) were observed in MET group (p < 0.05). The lightness (L) and redness (a) were increased (p < 0.05) in breast muscles of MET group, while only the redness (a*24 h) and yellowness (b*24 h) were increased (p < 0.05) in thigh muscles of MET group. The gender has a significant (p < 0.05) effect on carcass traits and muscle redness (a*), where these traits improved in males, and no interaction between treatments and gender were observed for these results. The expression levels of PRKAG2 and PRDX4 supported the changes in muscle pH, with these up-regulated in thigh and breast muscles of MET group, the PPP1R3A gene supported the changes in pH value being down-regulated (p < 0.01) in these same muscles. The BCO1 gene expression was consistent with the changes in meat color and was up-regulated (p < 0.01) in thigh muscles of MET group, consistent with the changes in b* color values. Finally, it was concluded that the supplementation of 0.1% Met to rooster diets could improve carcass characteristics and meat quality of progeny.
Highlights
Continuous genetic selection, has resulted in fast growing broilers that reach market weight by six weeks of age with high meat yield [1]
A methyl group provided by S-adenosylmethionine is required for the biosynthesis of epinephrine, choline, carnitine, and creatine, which are essential for muscle development [10,11]
This study aimed to explore the transgenerational influences of paternal dietary Met on meat quality and carcass traits of progeny
Summary
Continuous genetic selection, has resulted in fast growing broilers that reach market weight by six weeks of age with high meat yield [1]. For corn-based broiler diets, methionine (Met) is considered the first limiting specific amino acid for synthesis of protein and the source of S-adenosylmethionine, the donor of methyl group for DNA methylation [7,8,9]. Previous studies proved that many feed additives, including vitamins [13], minerals [14], or the presence of toxins [15] in laying hen diets have a trans-generational effect on progeny performance. There are reports identifying the influence of maternal nutrition of laying hens on meat quality, growth and disease resistance of progeny [14,16,17]. Some reports studied the effect of maternal dietary Met on the chicken progeny [16], ducks [17], and Japanese quail [18]
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