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Blood Gonadotrophic Activity in Carabao Heifer During the Estrous Cycle
Thesis Abstract:
Day-old Single Comb White Leghorn chicks were used in an experiment to assess the effects of the follicle stimulating hormone (FHS), luteinizing hormone (LH) and blood gonadotrophic hormone from carabao heifer undergoing the estrous cycle.
FSH produced a significant increase in testicular weights and tubular diameter. A significant positive correlation was found between weights of the chicks’ testes and FHS dosages.
LH also increased testicular weights but to a lesser degree than the effect of FSH. A significant positive correlation was obtained between testes weights and LH dosages. Also, the interstitial tissues became more distinct in the stroma.
The gonadotrophic potency of the carabao heifers was lowest at the start of estrus, highest on the 12th day and dropped markedly on the 20th day. A very high positive association was noted between gonadotrophic activity and day of the estrous cycle.
No significant differences were observed among the physiological parameters measured during the estrous cycle of the carabao heifers, although the average pulse rate, respiration rate and rectal temperature were high at day of estrus. No significant correlations were found between estrous cycle and pulse rate, and between respiration rate and rectal temperature. Negative correlations were obtained between gonadotrophic activity and pulse rate, and between respiration rate and rectal temperature.
As to diurnal variations, pulse rate, respiration rate and rectal temperature were highest in the afternoon and lowest in the morning.