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Lactation yield as affected by month of calving,age at first calving, inter calving and dry period, order of lactation and lactation length in tharparkar cattle

By: Nagpaul, P K.
Publisher: Karnal NDRI 1968Subject(s): Dairy-HusbandaryDissertation note: M.sc. Thesis Panjab University 1968 Bhatnagar, D S Summary: A very much higher proportion of younger cows breshened more in summer and winter than in rainy season. Percentage of calving was lowest in November to January. Milk production for the cows freshening in September was lowest and the maximum yield was obtained for the cows which calved in the month of November followed by March and February. Milk production was highest in fourth lactation. Average age at first calving of Tharparkar animals was found to be 38.45 +7.75 (SD) months. Cows calving betwen 25 to 30 months age group had an opporturnity to produce milk for longr period. Average inter calving period was found to be 429.90 +2.97 (SE) days. Average dry period was calculated to be 147.28 days. Animals having dry period less than 30 days produced significantly less milk. Mean lactation length for the fourth, fifth and sixth lactations was more than average lactation length found in the herd.
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Thesis/Dissertation Thesis/Dissertation NDRI Karnal
Reference Book Collection
Non-fiction M-116 (Browse shelf) Not for loan 16514

M.sc. Thesis Panjab University 1968 Bhatnagar, D S

A very much higher proportion of younger cows breshened more in summer and winter than in rainy season. Percentage of calving was lowest in November to January. Milk production for the cows freshening in September was lowest and the maximum yield was obtained for the cows which calved in the month of November followed by March and February. Milk production was highest in fourth lactation. Average age at first calving of Tharparkar animals was found to be 38.45 +7.75 (SD) months. Cows calving betwen 25 to 30 months age group had an opporturnity to produce milk for longr period. Average inter calving period was found to be 429.90 +2.97 (SE) days. Average dry period was calculated to be 147.28 days. Animals having dry period less than 30 days produced significantly less milk. Mean lactation length for the fourth, fifth and sixth lactations was more than average lactation length found in the herd.

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