Title

Genetic and environmental effects on the lactation curve of dairy goats in the tropics

Document Type

Article

Publication Date

5-1-2017

Publication Title

Livestock Research for Rural Development

Abstract

The objective of this work was to estimate the parameters of lactation curves in goats, such as time to peak (TP), peak production (PP), persistence (PER) and cumulative production at 210 days Lactation (P210), and to determine the effects of calving time, number of births, breed type, and nutritional management. The lactation curve parameters were obtained analyzing 4,160 dairy controls, and 467 lactations from different sheepfold of goats from the department of Antioquia-Colombia. Individual records of calving dates, calving number and calving type were included in the analyses. Parameter estimations and lactation curve were obtained using the Nelder model. In addition, phenotypic correlations between each of the characteristics of the lactation curve were estimated. The results showed a peak time of 23.9 days, with an associated production of 2.11 kg. The average persistence was 64.3% and the accumulated production at 210 days in milk of 285 kg. A significant effect of breed type on P210 and number of births on PP and PER was found, and a highly significant effect of the calving period on P210 and TP. The results suggest that it is possible to estimate the functions that characterize the lactation curves of the goats of Antioquia and the genetic and environmental phenomena that affect them.

Volume

29

Issue

5

ISSN

01213784

Identifier

SCOPUS_ID:85018414423

Documento original

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