The effect of feed intake and growth hormone-releasing factor on lactating dairy cows

Journal of Dairy Science
H LapierreD Petitclerc

Abstract

Twenty-four lactating dairy cows, averaging 30.0 kg/d of milk and 159 d of lactation, were used to study the effect of feed intake and growth hormone-releasing factor in a 2 x 2 factorial arrangement. For the first 10-d period, cows had free access to a TMR and received a fixed amount of high moisture corn, protein supplement, and hay. In the second 10-d period, 12 cows were maintained on this high intake, and 12 cows received 70% of their previous intake (low intake). During the following 10-d period, each intake group was divided, and each of two subgroups (n = 6) received twice daily s.c. injections of saline or growth hormone-releasing factor (10 micrograms/kg of BW per injection). Feed restriction decreased milk production by 24%. Milk production increase was not different following growth hormone-releasing factor treatment for cows maintained at high intake (4.6 kg/d) or low intake (3.4 kg/d). Feed restriction increased concentration of growth hormone but did not affect IGF-I concentration. Growth hormone-releasing factor increased IGF-I concentration similarly for both intake groups but increased concentrations of insulin and IGF-binding proteins-1 and -3 only in the high intake group. Low intake did not affect growth ho...Continue Reading

References

Jul 1, 1992·Domestic Animal Endocrinology·H LapierreP Brazeau
Jan 1, 1991·Molecular and Cellular Endocrinology·H JammesJ Djiane
Jun 1, 1989·Journal of Dairy Science·C K ReynoldsP J Reynolds
Aug 1, 1982·Journal of Dairy Science·J A Bines, I C Hart

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Citations

Dec 24, 2013·Journal of Dairy Science·L F FerrarettoM C Wiltbank
Jul 2, 2021·Journal of Animal Science·Antoine LeducMarion Boutinaud

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