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Animal Reproduction and Physiology
Asian-Australasian Journal of Animal Sciences 2010;23(2): 169-174.
DOI: https://doi.org/10.5713/ajas.2010.90193    Published online December 22, 2009.
Endocrine Profiles of Oestrous Cycle in Buffalo: A Meta-analysis
S. Mondal, K. P. Suresh, S. Nandi
Abstract
A meta-analysis was conducted to summarize the results of studies which have described the profiles of hormones during the oestrous cycle in buffalo using a fixed effect model and a random effect model. Plasma progesterone concentrations were lowest (0.30??.06 ng/ml) during the peri-oestrous phase and increased (p = 0.067) through the early luteal phase to a maximum concentration (1.94??.03 ng/ml) during the mid-luteal phase. Circulating plasma inhibin and estradiol concentrations were lowest (0.31??.01 and 11.04??.13 ng/ml) during the mid-luteal phase, increased through the late luteal phase to maximum concentrations (0.44??.02 and 22.48??.32 ng/ml) during the peri-oestrous phase. Plasma FSH concentrations were lowest during the early luteal phase and increased through the mid-luteal phase to a maximum concentration during the peri-oestrous phase. Peripheral prolactin concentrations were lowest during the late luteal phase and increased to a maximum concentration during the peri-oestrous phase which then declined (p = 0.716) during the early luteal phase. Peripheral plasma cortisol concentrations decreased from 2.68??.14 ng/ml during the early luteal phase to 1.43??.27 ng/ml during the mid-luteal phase (p<0.001) which then increased to 2.06??.17 ng/ml during the late luteal phase. Plasma T3 concentrations decreased from the late luteal phase to the peri-oestrous phase (p<0.001) which then increased during the early luteal phase. T4 concentrations increased from the late luteal phase to the peri-oestrous phase which then decreased during the early luteal phase.
Keywords: Meta-analysis; Buffalo; Fixed Effect Model; Random Effect Model; Oestrous Cycle


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