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The effects of feeding protected and unprotected casein on the milk production of cows grazing ryegrass

Published online by Cambridge University Press:  27 March 2009

D. J. Minson
D. J. Minson
Affiliation:
CSIRO Division of Tropical Crops and Pastures, St Lucia, Queensland 4067, Australia
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Extract

Milk production of cows grazing Rhodes grass without the addition of grain supplements can be increased by feeding casein protected from deamination in the rumen with formaldehyde (Stobbs, Minson & McLeod 1977; Flores, Stobbs & Minson, 1979). No increase in milk production was achieved when unprotected casein was fed, indicating that production on a tropical grass was limited by the quantity of amino acids absorbed from the small intestines (Stobbs et al. 1977). Formaldehydetreated casein (formal-casein) increased by 5% the milk production of cows grazing ryegrass in New Zealand when an energy supplement was also fed but had no effect oh milk yield when only ryegrass was fed (Wilson, 1970). In a review of this subject Clark (1975) reported that pen studies showed post-ruminal supplementation with casein increased milk production from 1 to 4 kg/day. The result with ryegrass in the absence of an energy supplement is therefore unexpected and warrants further study.

Type
Short Note
Information
The Journal of Agricultural Science , Volume 96 , Issue 1 , February 1981 , pp. 239 - 241
Copyright
Copyright © Cambridge University Press 1981

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References

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