Hostname: page-component-cd9895bd7-gvvz8 Total loading time: 0 Render date: 2024-12-24T01:59:37.406Z Has data issue: false hasContentIssue false
  • English
  • Français

A note on the effect of use of bovine somatotropin on the fatty acid composition of the milk fat in dairy cows

Published online by Cambridge University Press:  02 September 2010

P. Polidori ,
G. L. Maggi ,
V. M. Moretti ,
F. Valfrè  and
P. Navarotto
P. Polidori
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinara, Via Celoria 10, Milano 20133, Italy
G. L. Maggi
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinara, Via Celoria 10, Milano 20133, Italy
V. M. Moretti
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinara, Via Celoria 10, Milano 20133, Italy
F. Valfrè
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinara, Via Celoria 10, Milano 20133, Italy
P. Navarotto
Affiliation:
Istituto di Zootecnica, Facoltà di Medicina Veterinara, Via Celoria 10, Milano 20133, Italy
Get access

Abstract

Commencing on day 100 ± 10 of lactation, 10 Italian Friesian cows averaging 32·6 kg milk per day were injected biweekly with recombinant bovine somatotropin (BST), while 10 other cows averaging 33-4 kg milk per day were injected with a placebo. Cows were offered ad libitum a total mixed diet throughout the lactation. The experiment lasted 16 weeks; milk samples were taken before and 16, 62 and 91 days after the commencement of BST injection. The objective was to determine the impact of biweekly injections of BST on the synthesis and proportion of milk fatty acids, particularly on cis and trans isomers and on fatty acids with an odd number of carbon atoms (C15 and C17). A decrease in the proportion of shortchain (C4 to C14) fatty acids (P < 0·001) and an increase in the proportion of long-chain (C16 to C20) fatty acids (P < 0·001) were observed in the first period of the treatment. With regard to cis and trans isomers, a considerable increase of the cis isomers (P < 0·001), particularly C18.1cis9 (oleic acid) was observed, while differences in trans isomers were not statistically significant. Concentrations of C15 (pentadecanoic acid) were not affected but heptadecanoic acid (C17) concentration showed a considerable increase (P < 0·01) but only in the sample taken after 16 days.

Keywords

dairy cowsfatty acidsmilk fatsomatotropin
Type
Research Article
Information
Animal Production , Volume 57 , Issue 2 , October 1993 , pp. 319 - 322
Copyright
Copyright © British Society of Animal Science 1993

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Baer, R. J., Tieszen, K. M., Schingoethe, D. J., Casper, P. D., Eisenbeisz, W. A., Shaver, R. D. and Cleale, R. M. 1989. Composition and flavor of milk produced by cows injected with recombinant bovine somatotropin. Journal of Dairy Science 72:1424–1434.CrossRefGoogle Scholar
Bauman, D. E., Eppard, P. J., DeGeeter, M. J. and Lanza, G. M. 1985. Responses of high-producing dairy cows to long-term treatment with pituitary and recombinant somatotropin. Journal of Dairy Science 68:1352–1362.CrossRefGoogle ScholarPubMed
Bligh, E. G. and Dyer, W. J. 1959. A rapid method of total lipid extraction and purification. Canadian Journal of Biochemistry and Physiology 37: 911–917.CrossRefGoogle ScholarPubMed
Eppard, P. J., Bauman, D. E., Bitman, J., Wood, D. L., Akers, R. M. and House, W. A. 1985. Effect of dose of bovine growth hormone on milk composition: alactalbumin, fatty acids, and mineral elements. Journal of Dairy Science 68: 3047–3054.CrossRefGoogle Scholar
Gallo, L., Cassandro, M., Mantovani, R., Costa, A., Carnier, P., Ramanzin, M. and Bittante, G. 1992. Recombinant bovine somatotropin in dairy cows: effect of two intervals of treatment. Proceedings of the forty-third annual meeting of the European Association for Animal Production, Madrid, vol. 1, pp. 668–669.Google Scholar
Kinsella, J. E. 1970. Stearic acid metabolism by mammary cells. Journal of Dairy Science 53:1757–1765.CrossRefGoogle ScholarPubMed
Lynch, J. M., Barbano, D. M., Bauman, D. E., Hartnell, G. F. and Nemeth, M. A. 1992. Effect of a prolonged-release formulation of N-methionyl bovine somatotropin (Sometribove) on milk fat. Journal of Dairy Science 75: 1794–1809.CrossRefGoogle ScholarPubMed
McCutcheon, S. N. and Bauman, D. E. 1986. Effect of pattern of administration of bovine growth hormone on lactational performance of dairy cows. Journal of Dairy Science 69: 38–43.CrossRefGoogle ScholarPubMed
McGuffey, R. K., Green, H. B. and Basson, R. P. 1987. Performance of Holstein given bovine somatotropin in a sustained delivery vehicle. Effect of dose and frequency of administration. Journal of Dairy Science 70: suppl. 1, p. 177 (abstr.).Google Scholar
Palmquist, D. L. and Jenkins, T. C. 1980. Fat in lactation rations: a review. Journal of Dairy Science 63:1–14.CrossRefGoogle Scholar
Peel, C. J. and Bauman, D. E. 1987. Somatotropin and lactation. Journal of Dairy Science 70:474–486.CrossRefGoogle ScholarPubMed
Peel, C. J., Sandles, L. D., Quelch, K. J. and Herington, A. C. 1985. The effects of long-term administration of bovine growth hormone on the lactational performance of identical-twin dairy cows. Animal Production 41:135–142.Google Scholar
Statistical Analysis System Institute. 1982. SAS user's guide. SAS Institute, Cary, North Caroline.Google Scholar
Stegeman, G. A., Casper, D. P., Schingoethe, D. J. and Baer, R. J. 1992. Lactational responses of dairy cows fed unsaturated dietary fat and receiving bovine somatotropin. Journal of Dairy Science 75: 1936–1945.CrossRefGoogle ScholarPubMed
Sukhija, P. S. and Palmquist, D. L. 1988. Rapid method for determination of total fatty acid content and composition of feedstuffs and faeces. Journal of Agricultural and Food Chemistry 36: 1202–1206.CrossRefGoogle Scholar
Van den Berg, G. 1991. A review of quality and processing suitability of milk from cows treated with bovine somatotropin. Journal of Dairy Science 74: suppl. 2, pp. 2–11.Google ScholarPubMed