Effects of supplementing lysine and threonine on hormones in blood and milk of lactating mares

doi:10.6048/j.issn.1001-4330.2024.12.027

Abstract

Abstract:

【Objective】 Explore the effects of lysine and threonine supplementation on hormone concentrations in blood and milk of lactating mares under grazing conditions in the hope of providing reference for amino acid regulation of lactation performance and body health of lactating mares.【Methods】 12 Ili mares with similar foaling dates (May), ages of 7-9 years, parity of 4-5 fetuses, average weight of 428±33.42 kg and lactation for 30 days were selected.According to the principle of similar milk production, 12 mares were randomly divided into control group and experimental group.Under the same grazing conditions (grazing time, drinking time, milking time and grazing pasture were the same), set up control group and experimental group,the control group was not given any amino acid supplement, and the experimental group was given lysine 60 g+ threonine 40 g/(d· horses).The whole supplementary feeding period was 120 days, and milk samples and blood were collected regularly to determine hormone indexes.【Results】 The concentration of prolactin in the blood of the experimental group showed a continuous increasing trend, and was higher than that of the control group on the 60th day of the experiment (P > 0.05).In addition, the concentrations of estradiol, progesterone and growth hormone in the blood of the experimental group showed a trend of decreasing first and then increasing.The concentrations of estradiol, progesterone and luteinizing hormone in the blood of the control group increased first and then decreased.In milking period, on day 120, the concentrations of luteinizing hormone and growth hormone in milk of experimental group were significantly higher than those of control group (P< 0.01), and the concentrations of estradiol, prolactin and luteinizing hormone showed a trend of continuous increase, while the concentrations of progesterone and growth hormone showed a tendency of decreasing first and then increasing.However, in the control group, the concentrations of estradiol and prolactin decreased first and then increased, and the concentrations of progesterone and growth hormone continued to decrease.【Conclusion】 In summary, supplementing lysine and threonine can increase the contents of progesterone and prolactin in the mare's blood, increase the concentrations of estradiol, prolactin and luteinizing hormone in milk, and maintain the normal physiological law of hormones in the mare's blood and milk.

Key words: lactating mare; lysine; threonine; hormone

摘要：

【目的】 研究放牧条件下泌乳母马补饲赖氨酸和苏氨酸对其血液中和乳中激素浓度的影响,为氨基酸调控泌乳期母马的泌乳性能及机体健康提供参考依据。【方法】 选择产驹日期相近(5月),年龄7~9岁、胎次4~5胎、平均体重(428±33.42) kg和泌乳30 d的伊犁马母马12匹。按照产奶量相近的原则将12匹母马随机分为对照组和试验组。于相同放牧条件下(放牧时间、饮水时间、挤奶时间和放牧草场完全相同),对照组不补喂任何氨基酸,试验组补喂赖氨酸60+苏氨酸40(g/(d·匹))。整个补饲期为120 d,定期采集母马乳样及血液,测定激素指标。【结果】 在血液中,母马试验组的催乳素浓度呈持续上升趋势,且在试验的第60 d高于对照组(P>0.05),此外,试验组血液中的雌二醇、孕酮和生长激素浓度均呈先下降后上升的趋势,而对照组血液中雌二醇、孕酮和促黄体素浓度均呈先上升后下降的趋势;试验第120 d试验组乳中促黄体素和生长激素浓度均极显著高于对照组(P<0.01),雌二醇、催乳素和促黄体素浓度均呈持续升高趋势,孕酮和生长激素浓度呈先下降后上升趋势。但对照组雌二醇和催乳素浓度呈先下降后上升趋势,且孕酮和生长激素浓度呈持续下降趋势。【结论】 母马补喂赖氨酸和苏氨酸可以增加母马血液中孕酮及催乳素含量,提高乳中雌二醇、催乳素和促黄体素浓度,使母马血液及乳中激素保持正常的生理规律,保证了泌乳期母马的机体健康。

关键词: 泌乳母马, 赖氨酸, 苏氨酸, 激素

CLC Number:

S821

JING Hongxin, LI Minghao, WANG Jianwen, Abuduwaresi Abulikemu, LI Xiaobin. Effects of supplementing lysine and threonine on hormones in blood and milk of lactating mares[J]. Xinjiang Agricultural Sciences, 2024, 61(12): 3113-3120.

经宏鑫, 李明浩, 王建文, 阿布都瓦热斯·阿布力克木, 李晓斌. 补喂赖氨酸和苏氨酸对泌乳母马血液和乳中激素的影响[J]. 新疆农业科学, 2024, 61(12): 3113-3120.

Figures/Tables 2

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