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Extending lactation in pasture-based dairy cows. II: Effect of genetic strain and diet on plasma hormone and metabolite concentrations.
J Dairy Sci 2009; 92(8):3704-13JD

Abstract

Fifty-six genetically divergent New Zealand and North American Holstein-Friesian (HF) cows grazed pasture, and were offered 0, 3, or 6 kg of concentrate DM/cow per day for an extended lactation (605 +/- 8.3 d in milk; mean +/- standard error of the mean). Weekly blood samples collected from individual cows from wk 1 to 10 postpartum (early lactation), and from wk 47 to 63 postpartum (extended lactation) were analyzed for nonesterified fatty acids (NEFA), glucose, insulin, leptin, growth hormone (GH), insulin-like growth factor-I (IGF-I), calcium, and urea. During early lactation, NEFA and GH concentrations were greater and IGF-I concentrations were less, and increased at a slower rate in North American HF. During this 10-wk period, there were no strain effects on plasma glucose, leptin, insulin, or calcium. During the extended lactation period, North American HF had greater NEFA and GH concentrations; there were strain x diet interactions for insulin and leptin, and a tendency for a strain x diet interaction for glucose. These interactions were primarily due to greater plasma insulin, leptin, and glucose concentrations in the New Zealand HF fed 6 kg of concentrate DM/cow per day, a result of excessive body condition in this treatment. In this period, there was no strain effect on plasma IGF-I, calcium, or urea concentration. During early lactation, there was a linear increase in glucose and IGF-I, and a linear decrease in GH and urea with increasing concentrate in the diet. However, plasma calcium, NEFA, insulin, and leptin remained unchanged. During the extended lactation period, there was an effect of feed supplementation on GH and urea, which decreased linearly with increasing concentrate in the diet. There was, however, no supplementation effect on NEFA, calcium, or IGF-I. These data indicate potential strain differences in recoupling of the somatotropic axis, insulin resistance, and energy partitioning, and may help explain the physiology behind the previously reported greater milk production and body condition score loss in North American HF. The results have implications for breeding and diet management during an extended lactation.

Authors+Show Affiliations

DairyNZ Ltd., Private Bag 3221, Hamilton, 3240, New Zealand. jane.kay@dairynz.co.nzNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19620652

Citation

Kay, J K., et al. "Extending Lactation in Pasture-based Dairy Cows. II: Effect of Genetic Strain and Diet On Plasma Hormone and Metabolite Concentrations." Journal of Dairy Science, vol. 92, no. 8, 2009, pp. 3704-13.
Kay JK, Phyn CV, Roche JR, et al. Extending lactation in pasture-based dairy cows. II: Effect of genetic strain and diet on plasma hormone and metabolite concentrations. J Dairy Sci. 2009;92(8):3704-13.
Kay, J. K., Phyn, C. V., Roche, J. R., & Kolver, E. S. (2009). Extending lactation in pasture-based dairy cows. II: Effect of genetic strain and diet on plasma hormone and metabolite concentrations. Journal of Dairy Science, 92(8), pp. 3704-13. doi:10.3168/jds.2008-1976.
Kay JK, et al. Extending Lactation in Pasture-based Dairy Cows. II: Effect of Genetic Strain and Diet On Plasma Hormone and Metabolite Concentrations. J Dairy Sci. 2009;92(8):3704-13. PubMed PMID: 19620652.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Extending lactation in pasture-based dairy cows. II: Effect of genetic strain and diet on plasma hormone and metabolite concentrations. AU - Kay,J K, AU - Phyn,C V C, AU - Roche,J R, AU - Kolver,E S, PY - 2009/7/22/entrez PY - 2009/7/22/pubmed PY - 2009/10/20/medline SP - 3704 EP - 13 JF - Journal of dairy science JO - J. Dairy Sci. VL - 92 IS - 8 N2 - Fifty-six genetically divergent New Zealand and North American Holstein-Friesian (HF) cows grazed pasture, and were offered 0, 3, or 6 kg of concentrate DM/cow per day for an extended lactation (605 +/- 8.3 d in milk; mean +/- standard error of the mean). Weekly blood samples collected from individual cows from wk 1 to 10 postpartum (early lactation), and from wk 47 to 63 postpartum (extended lactation) were analyzed for nonesterified fatty acids (NEFA), glucose, insulin, leptin, growth hormone (GH), insulin-like growth factor-I (IGF-I), calcium, and urea. During early lactation, NEFA and GH concentrations were greater and IGF-I concentrations were less, and increased at a slower rate in North American HF. During this 10-wk period, there were no strain effects on plasma glucose, leptin, insulin, or calcium. During the extended lactation period, North American HF had greater NEFA and GH concentrations; there were strain x diet interactions for insulin and leptin, and a tendency for a strain x diet interaction for glucose. These interactions were primarily due to greater plasma insulin, leptin, and glucose concentrations in the New Zealand HF fed 6 kg of concentrate DM/cow per day, a result of excessive body condition in this treatment. In this period, there was no strain effect on plasma IGF-I, calcium, or urea concentration. During early lactation, there was a linear increase in glucose and IGF-I, and a linear decrease in GH and urea with increasing concentrate in the diet. However, plasma calcium, NEFA, insulin, and leptin remained unchanged. During the extended lactation period, there was an effect of feed supplementation on GH and urea, which decreased linearly with increasing concentrate in the diet. There was, however, no supplementation effect on NEFA, calcium, or IGF-I. These data indicate potential strain differences in recoupling of the somatotropic axis, insulin resistance, and energy partitioning, and may help explain the physiology behind the previously reported greater milk production and body condition score loss in North American HF. The results have implications for breeding and diet management during an extended lactation. SN - 1525-3198 UR - https://www.unboundmedicine.com/medline/citation/19620652/Extending_lactation_in_pasture_based_dairy_cows__II:_Effect_of_genetic_strain_and_diet_on_plasma_hormone_and_metabolite_concentrations_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-0302(09)70692-7 DB - PRIME DP - Unbound Medicine ER -