| 41. | He is testing for when the female enters estrus, which is when mating begins.
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| 42. | Dogs do not experience menopause; the canine estrus cycle simply becomes irregular and infrequent.
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| 43. | They will prevent a ewe from accessing tending areas before she even goes into estrus.
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| 44. | Another important physiological change related to sexuality in humans was the evolution of hidden estrus.
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| 45. | Some fillies may exhibit estrus as yearlings.
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| 46. | When females go into estrus aggressiveness increases.
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| 47. | Reproduction is seasonal, with gestation lasting 5 6 months and estrus lasting 4 months.
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| 48. | It was released in 1997 on Estrus.
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| 49. | Usually a system of synchronized estrus, pregnancy and births produces cubs of the same age.
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| 50. | Most importantly, during estrus she will stand still when mounted by another cow or bull.
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