HYPOTHALAMIC NEUROTRANSMITTER CONCENTRATIONS AND MEAT QUALITY IN STRESSED PIGS OFFERED EXCESS DIETARY TRYPTOPHAN AND TYROSINE

被引:71
作者
ADEOLA, O [1 ]
BALL, RO [1 ]
机构
[1] UNIV GUELPH,DEPT ANIM & POULTRY SCI,GUELPH N1G 2W1,ONTARIO,CANADA
关键词
NEUROTRANSMITTERS; STRESS; MEAT QUALITY; AMINO ACIDS; PIGS; SEROTONIN;
D O I
10.2527/1992.7061888x
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Pale, soft, exudative (PSE) pork occurs, for the most part, from environmental stress on the pig. Amino acid intake may be related to stress susceptibility through hormone and neurotransmitter induction. Two experiments were conducted to determine whether supplementation of 5 g of tryptophan (TRP) or 10 g of tyrosine (TYR) per kilogram of a 14% CP diet would alter the response of pigs to stress as measured by hypothalamic neurotransmitter concentrations and incidence of PSE. Twenty-four (Exp. 1) and 36 (Exp. 2) 92-kg pigs were offered one of three diets: control, TRP-, or TYR-supplemented for 5 d before slaughter. Dietary TRP or TYR supplementation in Exp. 1. doubled (P < .05) plasma TRP and TYR concentrations, respectively, and increased (P < .05) 5-hydroxytryptamine, dihydroxyphenyl ethylamine, dihydroxyphenyl acetic acid, and homovanillic acid concentrations in the hypothalamus. Pigs that exhibited stress at slaughter had lower (P < .05) hypothalamic concentrations of epinephrine, norepinephrine, and 5-hydroxytryptamine. In Exp. 2, pigs were trucked 55 km to a commercial meat packing facility and slaughtered without a rest period. This handling procedure was designed to invoke a high incidence of PSE pork and thus be a strong test of treatments. Supplemental dietary amino acids seemed to alter the frequency distribution of the severity of PSE pork. These data indicate that dietary manipulation of amino acid precursors of neurotransmitters may offer a practical means of reducing stress response in swine.
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页码:1888 / 1894
页数:7
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