Effects Of Live Yeast Supplementation On Ovarian Dynamic And Reproductive Performance In Transition Dairy Cows During High Ambient Temperature

سال انتشار: 1397
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 435

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شناسه ملی سند علمی:

ISERB04_110

تاریخ نمایه سازی: 16 تیر 1397

چکیده مقاله:

Two series of experiments were conducted to investigate the reproductive performance of transition dairy cows in response to supplementation with a live yeast culture (Probio- Sacc®, Biochem, Germany) under high ambient temperature. In Exp. 1, two groups of 6 periparturient Holstein cows were fed a diet without or with 4 g yeast/d/head starting 21 d prepartum through 8 wk postpartum to investigate estradiol and progesterone and ovarian follicular dynamics. In Exp. 2, from d 1 through d 70 postpartum, a total of 150 Holstein cows (75 cows per group) were assigned at random into 1 of 2 groups and received either 0 or 4 g live yeast/d/head to investigate their reproductive performance at 120 and 150 d postpartum. In 1st exp, circulating progesterone and estradiol-17 beta concentrations were found to be greater in yeast-supplemented cows than those receiving no yeast. The mean diameter of the ovulatory follicles was greater (17.2 vs. 18.4 mm; P < 0.01) in yeast-fed cows than those in control treatment. Duration of estrus was also shortened by an average of 2.6 d (P = 0.05), which is indicative a faster resumption of ovulatory activity. In 2nd exp., days open, days to first service, conception rate at d 120 and 150, and the proportion of pregnant cows at 120 and 150 postpartum were observed to be higher for cows receiving yeast supplement compared with no yeast.Overall, it appears that live yeast supplementation would beneficially improve the reproductive performance and ovarian dynamic of dairy cows during the heat stress.

نویسندگان

Amir Hossein Nasiri

pardis College of Agriculture and Natural Resources, University of Tehran, Animal Science Department

Armin Tohidi

Tehran university animal science department

Malek Shakeri

Tehran university animal science department

Mahdi Jhendi

Tehran university animal science department