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Research Article| Volume 8, ISSUE 4, P32-36, December 1992

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Effects of Feeding A High Lipid Diet on the Reproductive Cycle in Zebu Cross-Bred Beef Cattle1

  • Author Footnotes
    1 Present address: Dept. Anim. Sci., Univ. Nebraska, Lincoln 68583.Reviewed by T. W. White and H. W. Essig.
    I.M. Sohaili
    Footnotes
    1 Present address: Dept. Anim. Sci., Univ. Nebraska, Lincoln 68583.
    1 Reviewed by T. W. White and H. W. Essig.
    Affiliations
    Arkansas State University State University, AR 72467
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  • W.D. Humphrey
    Affiliations
    Arkansas State University State University, AR 72467
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  • Author Footnotes
    1 Present address: Dept. Anim. Sci., Univ. Nebraska, Lincoln 68583.Reviewed by T. W. White and H. W. Essig.
DOI:https://doi.org/10.15232/S1080-7446(15)32156-2
Effects of Feeding A High Lipid Diet on the Reproductive Cycle in Zebu Cross-Bred Beef Cattle1
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      Abstract

      Fifty crossbred cows were used determine the effects of feeding dietary lipids during the postpartum period on conception rate at synchronized estais (CSE), overall pregnancy rate (PR), blood lipoproteins, insulin, and luteinizing hormone (LH). Animals were randomly assigned to a diet with treatment 1 (n = 25) receiving 4.10% lipid and treatment 2 (n = 25) receiving 9.77% lipid (45% rice bran) for 40 d. Five animals from each treatment were challenged with GnRH (100 μg/cow) and blood was collected at 15-min intervals during the next 2 h for LH analysis. Prior to synchronization blood was collected for cholesterol, triglyceride, and insulin analysis. Animals were rectally palpated at 70 and 140 d to determine CSE and PR. Treatment 2 had a higher average gain during the feeding period, 24.4 ± .6 kg, compared to treatment 1, 16.9 ± .5 kg (P<.01). Serum cholesterol was lower in treatment 2, 193.5 ± 8.4 mg/dL compared to treatment 1, 216.8 ± 10.3 mg/dL (P<.1) with triglycerides being higher in treatment 2, 47.2 ± 2.9 mg/dL, relative to treatment 1, 35.7 ±1.7 mg/dL (P<.01). Serum insulin in treatment 2 was 1.46 ± .1 ng/ml, compared to treatment 1, 1.19 ± .06 ng/ml (P<.05). Overall pregnancy rate in treatment 2 was 96% compared to 80% in treatment 1 (P<.1). CSE was 56% in treatment 2, in contrast to 32% in treatment 1 (P<.05). Magnitude of the LH peak was higher in treatment 2, 7.3 ± 2.6 ng/ml, relative to treatment 1, 2.4 ± 0.5 ng/ml (P<.1). Higher levels of insulin may promote steroidogenesis. These data suggest that rice bran is hypocholesterolemic in cattle, but this does not seem to hinder steroidogenesis. Increased CSE and PR indicate that ovarian function is not impaired by lower levels of cholesterol.

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      DOI: https://doi.org/10.15232/S1080-7446(15)32156-2

      Copyright

      © 1992 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.

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