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Fat supplementation influences postpartum reproductive performance in Brahman cows
C A De Fries1, D A Neuendorff, R D Randel
1Texas Agricultural Experiment Station, Overton 75684, USA.
Journal of Animal Science
|April 16, 1998
Summary
Supplementing Brahman cows with rice bran improved body condition and ovarian follicular growth, leading to higher pregnancy rates. This dietary fat enhanced reproductive efficiency in postpartum beef cattle.
Area of Science:
- Animal Science
- Reproductive Biology
- Nutritional Physiology
Background:
- Postpartum recovery and reproductive cyclicity are critical for beef cattle productivity.
- Dietary fat supplementation can influence metabolic status and reproductive outcomes in multiparous cows.
- Rice bran is a potential source of beneficial fatty acids for livestock diets.
Purpose of the Study:
- To evaluate the effects of dietary fat supplementation, specifically rice bran, on the reproductive performance of postpartum Brahman cows.
- To assess the impact of rice bran on body condition, ovarian follicular dynamics, and pregnancy rates.
- To determine if rice bran influences postpartum interval and serum progesterone concentrations.
Main Methods:
- Forty multiparous Brahman cows were fed isocaloric and isonitrogenous diets with either 5.2% rice bran or 3.7% control fat from calving through the first estrous cycle.
- Body condition, weight, and blood samples were collected weekly; ovarian follicular populations were assessed via ultrasonography.
- Cows were bred post-estrus, and pregnancy rates, postpartum intervals, and calf weights were recorded.
Main Results:
- Cows fed rice bran exhibited improved body condition scores and greater numbers of small, medium, and total ovarian follicles.
- Fat supplementation increased medium, large, and total follicle counts and the size of the largest follicle before the first estrous cycle.
- Pregnancy rates tended to be higher (94.1% vs. 71.4%) in rice bran-supplemented cows, with a tendency for increased calf weight gain.
Conclusions:
- Dietary supplementation with rice bran enhances ovarian follicular development and improves body condition in postpartum beef cows.
- Rice bran, rich in oleic and linoleic acids, shows potential to increase pregnancy rates in beef cattle.
- This fat supplementation strategy positively impacts reproductive parameters without negatively affecting postpartum intervals or progesterone levels.