Effect of a Sustained-Release Form of Somatotropin on the Profile of Milk Proteins and Fatty Acids During a Full Lactation

Abstract

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Effect of somatotropin on the casein profile and κ-casein glycosylation in milk

“…However, changes in milk fatty acid profiles occur when cows are in negative energy balance caused by adipose tissue mobilization (Bitman et al 1984). We reported recently that, during a full lactation, monthly milk analyses revealed no significant changes in the fatty acid composition and in the milk casein (CN) profile when cows were treated with a 28-d sustained-release form of rbST (Leonard et al 1990b (Takeuchi et al 1985), the micelle size (Doi et al 1979a), and its susceptibility to chymosin proteolysis (Doi et al 1979b;Vreeman et al 1986;Haque and Khalifa 1992 (Gallo 1989 (Gallo 1989;Gallo and Block 1990). The 7-wk sample period was selected because cows were fbund to respond to rbST in this length of time (Gallo 1989 There was an average decrease of 10% when nonadjusted means for daily milk production, before and during treatment, were compared.…”