By William Haresign
Read or Download Recent Advances in Animal Nutrition – 1977. Studies in the Agricultural and Food Sciences PDF
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Extra resources for Recent Advances in Animal Nutrition – 1977. Studies in the Agricultural and Food Sciences
Example text
All values are averages, some of which are associated with high variance. D. E. 2 (see p. 2) is incorporated into microbial nitrogen; (/) 80 per cent of microbial nitrogen is in true protein form, and 20 per cent is in a non-utilisable NPN form; (g) 80 per cent of the microbial true protein will be absorbed (metabolizable protein); and (h) 87 per cent of the dietary true protein that escapes degradation in the rumen will be absorbed (metabolizable protein). A more detailed discussion of the evidence behind each assumption is available (Satter and Roffler, 1975).
A more thorough discussion is available elsewhere (Satter and Roffler, 1975). Simply stated, it involves making an allocation of metabolizable protein for maintenance and for milk production. A lactating cow losing weight is credited with the mobilised protein, and a lactating cow gaining weight has the added requirement for the tissue protein deposited. 4 g kg" 0 , 7 5 . 6 g kg - 0 ' 7 5 for cattle as suggested by Preston (1972) in a review of protein requirements of cattle. 5 g of metabolizable protein.
1972) results in a larger amount of metabolizable protein than suggested by Coppock et al (1968), but somewhat less than suggested by Paquay, DeBaere and Lousse (1972). The latter suggested that the mature cow is able to store and then lose 15 kg or more of body protein, but some of their observations were made with atypically large weight changes, and it is questionable whether these apply to the lactating cow. The assumption that 15 per cent of bodyweight is protein essentially agrees with body composition data from studies with cows (Reid, Wellington and Dunn, 1955).