@conference {41288,
	title = {Milk yield, prolactin and IGF-1 in cows which calve in Autumn; preliminary report},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {61},
	year = {2001},
	month = {Jan},
	pages = {210-212},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Christchurch},
	abstract = {The objective of this study was to investigate causes of reduced peak milk yield of autumn-calving cows. This experiment is part of a study that is comparing autumn- and spring-calving systems. Two groups of 17 multiparous, Friesian cows that had calved between April 1 and May 6 were fed either ad libitum on grazed pasture (G), or restricted pasture (10kg DM/cow/day) supplemented with maize silage (6kg DM/cow/day) (G + MZ) for a period of 21 days. Milk yield by cows on G increased by 6.2 litres over the 21-day period and was significantly higher (P< 0.01) than the yields of cows on G + MZ. Milk prolactin concentration had no significant association with milk yield. There were higher average plasma concentrations of IGF-1 in the G group (range 104-140ng/mL vs. 95-107ng/mL) that corresponded to higher average milk yields but IGF-1 concentration had no significant association with milk yield. Milk yield and milk prolactin concentration were negatively associated with condition score and plasma IGF-1 concentration was positively associated with condition score. },
	issn = {1176-5283},
	author = {Wrigley J and Holmes C and Lopez-Villalobos N}
}
