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Short-term effects of milking frequency on milk yield, milk composition, somatic cell count and milk protein profile in dairy goats

Published online by Cambridge University Press:  27 May 2014

Alexandr Torres ,
Lorenzo-Enrique Hernández-Castellano ,
Antonio Morales-delaNuez ,
Davinia Sánchez-Macías ,
Isabel Moreno-Indias ,
Noemi Castro ,
Juan Capote  and
Anastasio Argüello
Alexandr Torres
Affiliation:
Instituto Canario de Investigaciones Agrarias, La Laguna, Tenerife 38200, Spain
Lorenzo-Enrique Hernández-Castellano
Affiliation:
Department of Animal Science, Universidad de Las Palmas de Gran Canaria, Arucas 35413, Spain
Antonio Morales-delaNuez
Affiliation:
Department of Animal Science, Universidad de Las Palmas de Gran Canaria, Arucas 35413, Spain
Davinia Sánchez-Macías
Affiliation:
Agroindustrial Engineering Department, Universidad Nacional de Chimborazo, Riobamba 060150, Ecuador
Isabel Moreno-Indias
Affiliation:
Department of Animal Science, Universidad de Las Palmas de Gran Canaria, Arucas 35413, Spain
Noemi Castro
Affiliation:
Department of Animal Science, Universidad de Las Palmas de Gran Canaria, Arucas 35413, Spain
Juan Capote
Affiliation:
Instituto Canario de Investigaciones Agrarias, La Laguna, Tenerife 38200, Spain
Anastasio Argüello*
Affiliation:
Department of Animal Science, Universidad de Las Palmas de Gran Canaria, Arucas 35413, Spain
*
*For correspondence; e-mail: [email protected]
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Abstract

Goats in Canary Islands are milked once a day by tradition, but in most countries with high technology on farms, goats are milked twice a day, which is known to improve milk yield. Therefore it is important to know whether the increase of milking frequency can improve the production without impairing milk quality. The objective of this study was to investigate the short term effects of three milking frequencies on milk yield, milk composition, somatic cell count (SCC) and milk protein profile in dairy goats traditionally milked once a day. Twelve Majorera goats in early lactation (48±4 d in milk) were used. During a 5-week period, goats were milked once a day (X1) in weeks 1 and 5, twice a day (X2) in weeks 2 and 4, and three times a day (X3) in week 3. Milk recording and sampling were done on the last day of each experimental week. Milk yield increased by 26% from X1 to X2. No differences were obtained when goats were switched from X2 to X3, and from X3 to X2. The goats recovered the production level when they returned to X1. Different patterns of changes in the milk constituents due to the milking frequency effect were observed. Fat percentage increased when switched from X1 to X2, then decreased from X2 to X3, and from X3 to X2, whereas it did not show significant differences from X2 to X1. Milking frequency did not affect the protein and lactose percentages. SCC values were unaffected when goats were milked X1, X2 and X3, but then they increased slightly when milking frequency was returned to X2 and X1. Finally, quantitative analysis showed an increase in intensities of milk protein bands from X1 to X2, but the intensities of casein bands (αS1-CN, αS2-CN, β-CN, κ-CN) and major whey proteins (α-La, β-Lg) decreased from X2 to X3.

Keywords

Milking frequencymilk yieldmilk qualitydairy goat
Type
Research Article
Information
Journal of Dairy Research , Volume 81 , Issue 3 , August 2014 , pp. 275 - 279
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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