Study of economic loss due to extended calving intervals in dairy herds
1996
Mayo-Ramsay, J. | Suntorn Wittayakun (Sakon Nakhon Agricultural Research and Training Centre (Thailand))
Calving interval is used to determine the status of fertility within the herd. A calving interval (C.I.) of 365 days is optimum C.I.s. Significantly higher than this (or sometimes lower) effect the overall production of a cow and can cost the farmer a considerable amount in potential lost production. The price paid for the milk, calf value, cows milk production and the extra cost of concentrate during lactation are used to calculate the cost of potential lost production, due to extended C.I. the figures are worked out on a per day basis and multiplied by the number of days over 365 C.I. The figures in this model are averaged and do not take into account other costs such as extra labour, higher stocking rate, extra veterinary and breeding costs. The resultant figures would therefore be used as a guide rather than as a budgeting tool. It is possible to use the same formula and include more variables to create a more exact picture if required. Two models were used in this analysis. One was hypothetical and the other was a real herd situation in Sakhon Nakhon province in North East Thailand. Model One is a cow with a C.I. of 465 days and a 10 litre a day milk production. Total lost production (100 days) at a cost of 5,350 baht for one cow and 160,500 baht for a herd of 30 cows such as this. Model two is a herd of Holstein and Holstein cross cows with and average C.I. of 520 days. Cost in lost production (155 days) 9,851.8 baht per cow or 413,775.6 baht for the entire herd.
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