摘要 : The least squares means of lactation milk yield, lactation length, fat and SNF content in milk of crossbred cows was 3616.92+or-42.74 kg, 363.98+or-2.94 days, 4.20+or-0.02 and 9.03+or-0.04 per cent respectively. The effects of sea... 展开 The least squares means of lactation milk yield, lactation length, fat and SNF content in milk of crossbred cows was 3616.92+or-42.74 kg, 363.98+or-2.94 days, 4.20+or-0.02 and 9.03+or-0.04 per cent respectively. The effects of season of calving on lactation length and lactation order on SNF content in milk were significant. The lactation length of cows calved during rainy season (375.51+10.30 days) was significantly higher than those calved in winter and summer season. The SNF content in milk of cows of L₄ group (8.28+or-0.19) was significantly lower than in cows of L₁ to L₃ groups. The correlations of lactation milk yield and lactation length with fat and SNF content in milk were positive and significant (P<0.05). 收起