Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Influence of Pre-Mating Plasma Prolactin Profile on Reproductive Performance of California Doe Rabbits

Version 1 : Received: 17 April 2021 / Approved: 20 April 2021 / Online: 20 April 2021 (12:58:57 CEST)

How to cite: Abdel-Khalek, A.E.; Kalaba, Z.M.; Zaghloul, H.; Younan, G. Influence of Pre-Mating Plasma Prolactin Profile on Reproductive Performance of California Doe Rabbits. Preprints 2021, 2021040544 (doi: 10.20944/preprints202104.0544.v1). Abdel-Khalek, A.E.; Kalaba, Z.M.; Zaghloul, H.; Younan, G. Influence of Pre-Mating Plasma Prolactin Profile on Reproductive Performance of California Doe Rabbits. Preprints 2021, 2021040544 (doi: 10.20944/preprints202104.0544.v1).

Abstract

Abstract: Ovulation failure was associated with a reduction in pre-mating concentrations of oestradiol-17β and prolactin (PRL). The present study aimed to evaluate whether pre-mating PRL levels have a role on the reproductive efficiency of doe rabbits. A total of 78 multiparous California does (2nd parity) were divided, according to plasma pre-mating PRL, into five categories, >20-25, >25-30, >30-35, >35-40, and >40-45 ng/ml. Does in all categories were naturally mated and kindled, then their reproductive measurements and progesterone (P4) levels were determined. Results show that pre-mating PRL averaged 23.60±0.78, 28.00±0.83, 33.46±0.43, 38.17±0.49 and 41.98±0.68 ng/ml in five categories (p < 0.05), respectively, representing the highest distribution (38.5%) in the 3rd-category. Live body weight of doe rabbits, at mating, pregnancy, and parturition increased (p < 0.05) with increasing pre-mating PRL level. The number of services, litter size, and pregnancy rate increased (p < 0.05) by increasing PRL levels. Reproductive traits and P4 level at mid-pregnancy of does, and average weight of kits at birth increased (p < 0.05) by increasing PRL levels. The pre-mating PRL profile is important for the identification of reproductive performance in doe rabbits.

Subject Areas

litter size; prolactin; progesterone; pregnancy; rabbits

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