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

Content Provider	Scilit
Author	Torres, Alexandr Hernández-Castellano, Lorenzo-Enrique Morales-Delanuez, Antonio Sánchez-Macías, Davinia Moreno-Indias, Isabel Castro, Noemi Capote, Juan Argüello, Anastasio
Copyright Year	2014
Description	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 $(α_{S1}$-CN, $α_{S2}$-CN, β-CN, κ-CN) and major whey proteins (α-La, β-Lg) decreased from X2 to X3.
Related Links	https://www.cambridge.org/core/services/aop-cambridge-core/content/view/892239E018FA2A9129AE63DA50B1548D/S0022029914000211a.pdf/div-class-title-short-term-effects-of-milking-frequency-on-milk-yield-milk-composition-somatic-cell-count-and-milk-protein-profile-in-dairy-goats-div.pdf
Ending Page	279
Page Count	5
Starting Page	275
ISSN	00220299
e-ISSN	14697629
DOI	10.1017/s0022029914000211
Journal	Journal of Dairy Research
Issue Number	3
Volume Number	81
Language	English
Publisher	Cambridge University Press (CUP)
Publisher Date	2014-08-01
Access Restriction	Open
Subject Keyword	Journal of Dairy Research Food Science and Technology Milking Frequency Milk Yield Milk Quality Dairy Goat
Content Type	Text
Resource Type	Article
Subject	Medicine Animal Science and Zoology Food Science