不同氨基酸水平的低蛋白质饲粮对后备母猪初情日龄、血清代谢产物和激素浓度的影响

doi:10.11843/j.issn.0366-6964.2018.01.015

Abstract

Abstract:

The experiment was conducted to investigate the effects of different amino acid levels in low crude protein dites on age of puberty, serum metabolites and hormone concentration of replacement gilts based on ideal dietary amino acid pattern. 96 Landrace×Large White gilts, with initial body weight of (69.01±3.43) kg and similar body conditions, were allocated to 4 groups with 4 replicates per group. The gilts were fed respectively with 4 low-protein diets with different digestible lysine(DLys) levels of 0.61%(group 1), 0.66%(group 2), 0.71%(group 3), 0.76%(group 4) for the early phase(70 to 100 kg) and 0.55%(group 1), 0.60%(group 2), 0.65%(group 3), 0.70%(group 4) for the late phase(100 to 125 kg), and based on the same digestible amino acid pattern by adding synthetic amino acids. The results showed that:Serum circulating lysine concentrations was higher with increasing DLys (P<0.05), but serum triglyeride, glucose concentrations were similar among groups(P>0.05). The concentrations of serum insulin(INS), insulin growth factor-I (IGF-I), luteinizing hormone(LH) and estradiol(E₂) increased, then decreased with increasing DLys levels, and reached a maximum value in group 3(P>0.05), the concentration of serum INS in group 3 was significantly higher than those in group 1(P<0.05). Back fat thickness and ratio of estrus of gilts increased, then decreased with increasing DLys levels(P>0.05), the age of puberty of gilts in group 3 was significantly lower than those in group 4(P<0.05). The results indicated, based on ideal dietary amino acid pattern, the daily DLys intake were 17.82 and 17.29 g·d^-1 for 70-100 kg and 100-125 kg (DLys level in the low-protein diets should be 0.71% and 0.65%), respectively,which could increase the concentration of serum metabolites hormones INS, IGF-I, and elevate LH, E₂ secretion. Meanwhile, reduced the age of puberty and improved the ratio of estrus in gilts.

CLC Number:

S828.2

DONG Zhi-yan, LIU Ya-xuan, FANG Gui-you, MIAO Fu-rong, LIU Jing, YE Ding-cheng, LI Zhong-rong, LIN Chang-guang. Effects of Different Dietary Amino Acid Levels on Age of Puberty, Serum Metabolites and Hormone Concentration of Replacement Gilts Fed Low Protein Diets[J]. ACTA VETERINARIA ET ZOOTECHNICA SINICA, 2018, 49(1): 131-138.

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Effects of Different Dietary Amino Acid Levels on Age of Puberty, Serum Metabolites and Hormone Concentration of Replacement Gilts Fed Low Protein Diets

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