@conference {69531,
	title = {Productive and reproductive performance of Uruguayan Holstein and Urugyayan Holstein x New Zealand Holstein Friesian cows in a predominantly pasture-based system},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {70},
	year = {2010},
	month = {Jun},
	pages = {306-310},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {The performance of Uruguayan Holstein (UH) and UH x New Zealand Holstein Friesian first cross (UHNZHF) cows was investigated over 1 year using 62 cows offered predominantly native pasture. Accumulated 305 day yields of milk, fat, protein and milksolids (fat+protein) were not affected by the strain. The UH cows produced 0.5 L/d more milk than UH-NZHF cows at Day 240 of lactation (P <0.05). Fat and lactose percentages were greater in UH-NZHF cows (3.72 vs 3.44\% and 5.02 vs 4.94\%, respectively, P <0.0001). Protein percentages tended to be greater in UH-NZHF cows (3.31 vs 3.27\%, P = 0.08). The UH cows were 49 kg heavier (569 vs 520 kg, P <0.001) and required a greater energy requirement for maintenance. The UHNZHF cows produced more milksolids per kg of BW0.75, (P <0.01). Pregnancy rates tended to be greater in UH-NZHF cows (87 \% vs 71\%, P = 0.08) and were greater when the first 40 days of service were considered (61 vs 35\%, P = 0.04), which may be related to a differential energy partitioning according to strains.},
	issn = {1176-5283},
	author = {Periera I and Laborde D and Carriquiry M and Lopez-Villalobos N and Meikle A}
}
