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Effect of Diet Energy on Some Reproduction Indices and Hormones at Different Phase of Estrus Cycle in Holstein Heifers

Akbar Pirestani and Abbas Emamei Maybodi
Department of Animal Science, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
Abstract—The aim of study was determination of effects diet energy on estrogen, progesterone hormones and some reproduction indices in Holstein heifers. Sixty heifers of average bodyweight 320±20 kg were randomly divided to the two groups including: control (NRC recommendation) and high energy (HE) diet (10% higher than NRC recommendation). Heifers were fed initially 12 monthly, and used high energy diet during to 30 days. They were inseminated after observation of second heat. Blood samples were collected at the end of the feeding period in each phase of estrous cycle for the determination of estrogen and progesterone hormones concentrations to confirmed heifers pregnancy time. Also, it was evaluated reproduction indices such as service/conception rate and interval first heat to pregnancy rate. The result shows the estrogen hormone was increase in each phase of estrus in HE compare to control groups but no significantly. The progesterone hormone was significantly high of diestrus phase in HE compare to control groups. Also, lower service per conception rate and interval first heat to pregnancy rate was related to HE group but no significantly. It was concluded that high energy diet has beneficial effect on estrogen and progesterone hormones, and reproduction indices in Holstein heifers.

Index Terms—energy, reproduction indices, estrogen, progesterone, heifers

Cite: Akbar Pirestani and Abbas Emamei Maybodi,"Effect of Diet Energy on Some Reproduction Indices and Hormones at Different Phase of Estrus Cycle in Holstein Heifers," Vol. 4, No. 2, pp. 141-144, April 2015.
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