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犬常见的配种方法及过程

HEILONGJIANG ANIMAL SCIENCE AND VETERINARY MEDICINE(2010)

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Abstract
<正>犬属于季节性单次发情动物,但发情季节不太明显,一般一年发情2次,发情高峰多在春季的3—5月份和秋季的9—11月份。且在一个发情季节里只发情1次,不会出现反复发情。母犬在发情时主要表现为兴奋性增强,食欲减弱,饮水量上升,阴门肿胀,潮红,流出伴有血液的红色黏液;食欲减少,频频排尿,
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