Abstract
Milk yield and its composition are influenced by flow of substrates from the blood circulation to the mammary tissues. Body condition score (BCS) is an intermediate factor between the feed intake and the productivity status of the animal. Since energy intake does not keep pace with continuously rising milk yield, energy deficit in early lactation leads to a competitive
situation among milk yield, fertility and health of the dairy cow as these traits are linked by energy requirement. The present study was designed to investigate the effect of body condition and pregnancy on milk yield and composition in F1 crossbred cows (HolsteinFriesian X local cows). Fifty-eight cows (60 days postpartum) were selected at a large state farm. Pregnancy status was classified as: NP (non-pregnant), T-1 (pregnant trimester-I), T-II (trimester-II) and T-III (trimester-III). Milk yield (MY), milk composition (MC) and BCS were recorded weekly. The study continued up to 9 months postpartum during the year, 2007-2008. Pregnancy significantly affected the MY and MC (P<0.05). There was a linear increase in fat and protein contents with advancing pregnancy whereas lactose showed an opposite trend. NP animals had also lower milk yield compare to pregnant ones. BCS
correlated negatively with MPL and animals
with moderate BCS showed higher MPL. BCS
affected fat and protein contents as well as
milk yield. Milk yield was higher with moderate
BCS while fat and protein with higher one. BCS
correlated negatively with milk yield while
positively with fat and protein contents. It was
concluded that moderate BCS supported
higher milk yield.
Original language | English |
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Title of host publication | 6th International conference of the Egyptian Society for Experimental Biology |
Place of Publication | Egypt |
Publisher | Egyptian Society for Experimental Biology |
Pages | 247–253 |
Number of pages | 7 |
Volume | 6 |
Edition | 2 |
ISBN (Electronic) | 2090-0503 |
ISBN (Print) | 2090-0511 |
Publication status | Published - 2010 |
Event | Int Conf of the Egyptian Society for Experimental Biology - Minoufiya University, Cairo, Egypt Duration: 27 Feb 2010 → 04 Mar 2010 Conference number: 6 http://www.egyseb.net/fulltext/3-1430779443.pdf |
Conference
Conference | Int Conf of the Egyptian Society for Experimental Biology |
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Country/Territory | Egypt |
City | Cairo |
Period | 27/02/10 → 04/03/10 |
Internet address |