Article (Scientific journals)
Genetic evaluation of lactation persistency and total milk yield in dairy goats
Barbosa Dias de Siqueira, Otávio Henrique Gomes; REIS MOTA, Rodrigo; Oliveira, Hinayah Rojas et al.
2017In Livestock Research for Rural Development, 29 (7), p. 142
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Keywords :
genetic parameters; lactation curve; Wood model
Abstract :
[en] Lactation persistency (LP) has been neglected over time in genetic evaluations of dairy goats. The main reason for this is the difficulty to infer about the lactation curve shape. However, some lactations models such as Wood seem to be appropriate to provide persistency estimates under biological viewpoints. The aim of this study was to fit the Wood lactation model as well as to calculate and evaluate LP as selection criteria in dairy goat breeding programs through genetic parameters estimates. A total of 23,265 first lactation test day milk yield observations from 900 animals were used. The Wood random regression model was primarily fitted to estimate the lactation curve parameters (a, b and c), and then LP and total milk yield (TMY). Posteriorly, a multi-trait animal model was fitted considering simultaneously LP and TMY. The heritability estimates were 0.31 and 0.04 for TMY and LP, respectively. Based on the low LP heritability, selection based only on this trait might be inefficient. In conclusion, the results of this study suggests that selecting for high milk yields might result in high persistency since the genetic correlation between LP and TMY was moderate (0.39).
Disciplines :
Animal production & animal husbandry
Author, co-author :
Barbosa Dias de Siqueira, Otávio Henrique Gomes
REIS MOTA, Rodrigo ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition
Oliveira, Hinayah Rojas
Souza Duarte, Darlene Ana ;  Université de Liège - ULiège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition
Glória, Leonardo Siqueira
Rodrigues, Marcelo Texeira
Fonseca e Silva, Fabyano
Language :
English
Title :
Genetic evaluation of lactation persistency and total milk yield in dairy goats
Publication date :
July 2017
Journal title :
Livestock Research for Rural Development
eISSN :
0121-3784
Publisher :
Centro para la Investigación en Sistemas Sostenibles de Producción Agropecuaria, Cali, Colombia
Volume :
29
Issue :
7
Pages :
142
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 November 2017

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