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Leptin, GH, PRL, insulin and metabolic parameters throughout the dry period and lactation in dairy cows.
Reprod Domest Anim 2005; 40(3):217-23RD

Abstract

Leptin may play a role in the endocrine-metabolic processes that guarantee the physiological course of lactation in dairy cattle. This study was aimed at determining the changes in plasma concentrations of leptin and some of the main hormones and metabolites involved in the lactogenetic process in high-yielding dairy cows throughout lactation; we also wanted to assess whether leptin secretion is subjected to seasonal influences. Blood samples were collected from 23 Italian Friesian dairy cows from the end of a lactation to the ninth month of the subsequent one; in addition, blood was sampled from 47 dairy cows in different phases of lactation during February and July. Plasma concentrations of leptin, growth hormone (GH), insulin, prolactin (PRL), glucose, non-esterified fatty acids (NEFA) and urea were quantified by either validated radioimmunoassay (RIA) or enzymatic colorimetric methods. At the beginning of lactation, GH concentrations significantly increased, while a significant reduction occurred in leptin and insulin. This endocrine condition, such as the significant increase in NEFA plasma concentrations, is indicative of a marked lipid mobilization. In the more advanced stages of lactation, when both energy and protein balances become positive, leptin plasma concentrations increased, whereas GH and NEFA concentrations declined. During the summer months, a significant increase in leptin plasma concentrations, irrespective of the phase of lactation, was observed. Collectively, our findings suggest that, in dairy cows, leptin may represent a 'metabolic signal' of animal's status of fattening and nutritional level; in addition, leptin seems to be influenced by photoperiod and environmental temperature.

Authors+Show Affiliations

Dipartimento di Morfofisiologia Veterinaria e Produzioni Animali, Università di Bologna, Bologna, Italy.No affiliation info availableNo affiliation info availableNo 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

15943695

Citation

Accorsi, P A., et al. "Leptin, GH, PRL, Insulin and Metabolic Parameters Throughout the Dry Period and Lactation in Dairy Cows." Reproduction in Domestic Animals = Zuchthygiene, vol. 40, no. 3, 2005, pp. 217-23.
Accorsi PA, Govoni N, Gaiani R, et al. Leptin, GH, PRL, insulin and metabolic parameters throughout the dry period and lactation in dairy cows. Reprod Domest Anim. 2005;40(3):217-23.
Accorsi, P. A., Govoni, N., Gaiani, R., Pezzi, C., Seren, E., & Tamanini, C. (2005). Leptin, GH, PRL, insulin and metabolic parameters throughout the dry period and lactation in dairy cows. Reproduction in Domestic Animals = Zuchthygiene, 40(3), pp. 217-23.
Accorsi PA, et al. Leptin, GH, PRL, Insulin and Metabolic Parameters Throughout the Dry Period and Lactation in Dairy Cows. Reprod Domest Anim. 2005;40(3):217-23. PubMed PMID: 15943695.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Leptin, GH, PRL, insulin and metabolic parameters throughout the dry period and lactation in dairy cows. AU - Accorsi,P A, AU - Govoni,N, AU - Gaiani,R, AU - Pezzi,C, AU - Seren,E, AU - Tamanini,C, PY - 2005/6/10/pubmed PY - 2005/7/23/medline PY - 2005/6/10/entrez SP - 217 EP - 23 JF - Reproduction in domestic animals = Zuchthygiene JO - Reprod. Domest. Anim. VL - 40 IS - 3 N2 - Leptin may play a role in the endocrine-metabolic processes that guarantee the physiological course of lactation in dairy cattle. This study was aimed at determining the changes in plasma concentrations of leptin and some of the main hormones and metabolites involved in the lactogenetic process in high-yielding dairy cows throughout lactation; we also wanted to assess whether leptin secretion is subjected to seasonal influences. Blood samples were collected from 23 Italian Friesian dairy cows from the end of a lactation to the ninth month of the subsequent one; in addition, blood was sampled from 47 dairy cows in different phases of lactation during February and July. Plasma concentrations of leptin, growth hormone (GH), insulin, prolactin (PRL), glucose, non-esterified fatty acids (NEFA) and urea were quantified by either validated radioimmunoassay (RIA) or enzymatic colorimetric methods. At the beginning of lactation, GH concentrations significantly increased, while a significant reduction occurred in leptin and insulin. This endocrine condition, such as the significant increase in NEFA plasma concentrations, is indicative of a marked lipid mobilization. In the more advanced stages of lactation, when both energy and protein balances become positive, leptin plasma concentrations increased, whereas GH and NEFA concentrations declined. During the summer months, a significant increase in leptin plasma concentrations, irrespective of the phase of lactation, was observed. Collectively, our findings suggest that, in dairy cows, leptin may represent a 'metabolic signal' of animal's status of fattening and nutritional level; in addition, leptin seems to be influenced by photoperiod and environmental temperature. SN - 0936-6768 UR - https://www.unboundmedicine.com/medline/citation/15943695/Leptin_GH_PRL_insulin_and_metabolic_parameters_throughout_the_dry_period_and_lactation_in_dairy_cows_ L2 - https://doi.org/10.1111/j.1439-0531.2005.00581.x DB - PRIME DP - Unbound Medicine ER -