@conference {41420,
	title = {Diet and genotype affect feeding behaviour of Holstein-Friesian dairy cows during late lactation},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {63},
	year = {2003},
	month = {Jan},
	pages = {124-127},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Queenstown},
	abstract = {Ingestive behaviour of New Zealand (NZ) and overseas (OS) Holstein-Friesian (HF) dairy cows grazing pasture only or fed a total mixed ration (TMR) was observed in late lactation. Data from visual observations every 10 minutes over a 48-h period were used to evaluate differences in time spent feeding, ruminating, standing and lying. OS HF and cows fed TMR had greater dry matter intakes (DMI) than their respective comparisons. Cows grazing pasture spent more time feeding, less time ruminating, less time standing and the same time lying, compared to cows fed TMR. OS HF spent less time feeding, the same time ruminating, the same time standing, and more time lying compared to NZ HF. When expressed in terms of DMI, OS HF took less time to consume a kg of DM, and spent less time ruminating each kg of DM compared to NZ HF, irrespective of diet. A genotype x diet interaction was observed for time spent standing, with NZ HF spending more time standing when fed TMR, but standing for a similar time as OS HF when grazing. These results suggest feeding and grazing behaviour differences between HF cows of differing genotype, but similar breeding worth. },
	issn = {1176-5283},
	author = {Thorne PL and Jago JG and Kolver ES and Roche JR}
}
@conference {41361,
	title = {Total mixed rations versus pasture diets: Evidence for a genotype x diet on the concentration of amino acid-derived volatiles in milk},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {62},
	year = {2002},
	month = {Jan},
	pages = {246-251},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {<p>The performance of overseas (OS) and New Zealand (NZ) Holstein Friesian (HF) dairy cows were compared on an all-pasture diet (Grass) or a total mixed ration (TMR). Dietary treatments had been imposed for two years prior to the 2000/2001 season for which these results are reported. The four treatments were NZ Grass (n=14); OS Grass (n=13); NZ TMR (n=14); and OS TMR (n=14). Genotype x diet interactions were observed for annual milk yield, milksolids yield, efficiency of milksolids production, liveweight gain during lactation, and the proportion of cows not in calf. Measurement of individual cow intake using alkane markers during early, mid, and late lactation identified when these genotype x diet interactions occurred. When fed TMR, OS HF performed better than NZ HF, but on grass NZ HF performed better than OS HF. This has implications for the selection of sires for the national herd, and for the use of different dairy cow genotypes in different dairying systems.</p>},
	issn = {1176-5283},
	author = {Kolver ES and Roche JR and de Veth MJ and Thorne PL and Napper AR}
}
