Download e-book for kindle: Calf Rearing: A Practical Guide by John Moran

By John Moran

ISBN-10: 0643067663

ISBN-13: 9780643067660

Системы выращивания теленка играют серьезную роль в создании производительного и выгодного молочного стада. Многие молочные фермеры смогли улучшить генофонд телокв их стадах . Важно, чтобы онипонимали научную сторону процесса питания и развития теленка, чтобы помочь принятию решения относительно того, что является самым подходящим для каждой фермы. Эта книга предоставляет фермерам в доступной форме необходимую информацию, чтобы понять природу теленка, оценитьсвои ресурсы и развить стратегию управления процессом выращивания молодняка. Первый выпуск книги, изданный в 1993, был дополнен, включены результаты последних исследований в этой области, в частности, решение проблем возникающих в связи с последствиями глобального потепления. Эта информация поможет фермерам максимизировать их доходы от инвестиций вложенных в развитие стада.

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Example text

The colostrometer was developed specifically to determine Ig levels, but recent research has shown up some limitations. When using colostrometers to quantify Ig status, it is important to measure it at room temperature or, better still, using a thermometer to make certain the colostrum is measured at the recommended temperature. Colostrometers are good at detecting poor samples, but unfortunately they are limited in their ability to make other assessments. Their major role should be to screen samples to ensure only colostrum with more than 80 g/L of Ig is fed fresh or stored for later use.

There is little seasonal effect on colostrum quality. Some studies have found seasonal differences in acquired immunity in calves, but this is more related to changes in colostrum feeding management rather than colostrum quality. Two recent studies in Victoria have confirmed US findings that many of our dairy cows do not produce good quality first milking colostrum. Using a colostrometer to assess quality, colostrum was categorised as above, with the percentages of cows in the two studies producing poor (43 and 40%), moderate (31 and 37%), good (23 and 19%) and excellent (4 and 4%).

Once the calf has a functioning rumen, it is capable of supplying its own B vitamins, and these are not normally added to concentrate mixes. References and further reading Agricultural Research Council (1980), The Nutrient Requirements of Farm Livestock, No. 2, Second Edition, Agric. Res. , London, England. Ministry of Agriculture, Fisheries and Food (1984), Energy Allowances and Feeding Systems for Ruminants, HMSO, London, England. Moran, J. (1990), Growing Calves for Pink Veal. A Guide to Rearing, Feeding and Managing Calves for Pink Veal in Victoria.

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Calf Rearing: A Practical Guide by John Moran


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