RESEARCH PAPER

Effects of Dietary Concentrate to Forage Ratio on Body Condition, Reproductive Hormone Secretion and Plasma Biochemical Indices of Empty-Breasted Cows

  • CHEN Hao ,
  • WANG Chunjie ,
  • Simujide ,
  • CHEN Zhimeng ,
  • LIU Feihong ,
  • Aorigele
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  • 1. College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2. College of Veterinary Medicine, Inner Mongolia Agricultural University, Hohhot 010018, China

Received date: 2021-08-18

  Online published: 2022-03-14

Abstract

This experiment was conducted to investigate the effects of dietary concentrate to forage ratio on body condition, reproductive hormone secretion and plasma biochemical indices of empty-breasted cows. This experiment adopted a completely random design method, and equally divided 90 empty-breasted cows[(387.2±22.6) kg] with similar body condition, similar age, and thin body condition into 3 groups. Cows in the 3 groups were fed high concentrate to forage ratio diet (concentrate to forage ratio=65:35, HCD group), medium concentrate to forage ratio (concentrate to forage ratio=50:50, MCD group) and low concentrate to forage ratio diet (concentrate to forage ratio=35:65, LCD group). The pre-test period was 15 days, and the trial period was 60 days. The results showed as follows:on the 60th day of the trial period, the body weight and body condition score of the cows in the MCD and HCD groups were higher than those in the LCD group, but the difference was not significant (P>0.05); the average daily gain (ADG) and the body condition changes of the cows in the MCD and HCD groups were significantly higher than those in the LCD group (P<0.05); the estrus rate of the cows in the LCD group was significantly lower than that in the other two groups (P<0.05). On the 30th day of the trial period, the serum lutropin (LH) concentration of the cows in the HCD and MCD groups was significantly higher than that in the LCD group (P<0.05); the serum estradiol (E2) concentration of the cows in the MCD group was significantly higher than that in the LCD group (P<0.05). On the 45th day of the trial period, the serum LH, follicle-stimulating hormone (FSH) and E2 concentrations of the cows in the HCD and MCD groups were significantly higher than those in the LCD group (P<0.05). Serum LH and FSH concentrations in the MCD group reached the highest in estrus, and were significantly higher than those in the LCD group (P<0.05). On the 20th day of the trial period, the plasma glucose content of the cows in the HCD and MCD groups was significantly higher than that in the LCD group (P<0.05); on the 40th day of the trial period, the plasma glucose and triglyceride contents of the cows in the HCD group were significantly higher than those in the LCD group (P<0.05). The plasma urea nitrogen content of the cows in the HCD and MCD groups was significantly lower than that in the LCD group (P<0.05); on the 60th day of the trial period, the plasma glucose content of the cows in the HCD and MCD groups was significantly higher than that in the LCD group (P<0.05), and the plasma triglyceride content of the cows in the HCD group was significantly higher than that in the other two groups (P<0.05), and the plasma urea nitrogen content of the cows in the MCD group was significantly lower than that in the LCD group (P<0.05), and lower than that in the HCD group. The above results indicate that increasing the ratio of dietary concentrate to forage can improve the energy and protein metabolism of lean and empty cows, further improve the cow's body condition, and can effectively promote the secretion of reproductive hormones in the cow's body and shorten the estrus interval.

Cite this article

CHEN Hao , WANG Chunjie , Simujide , CHEN Zhimeng , LIU Feihong , Aorigele . Effects of Dietary Concentrate to Forage Ratio on Body Condition, Reproductive Hormone Secretion and Plasma Biochemical Indices of Empty-Breasted Cows[J]. Chinese Journal of Animal Nutrition, 2022 , 34(3) : 1569 -1579 . DOI: 10.3969/j.issn.1006-267x.2022.03.020

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