@conference {69527,
	title = {Application of resource allocation optimisation to provide profitable options for dairy production systems},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {70},
	year = {2010},
	month = {Jun},
	pages = {291-295},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {A linear program (LP) model analysed resource use on a 100 ha dairy farm. A single optimum-profit combination was established for resources which were either optimised or constrained. It was found that, with a fixed herd of 320 milking cows, when production increased from 305 kg milksolids per cow (kg MS/cow) to 415 kg MS/cow, cash profit increased by 65\%. This required additional supplements. If, however, feed demand and supply were optimised at 415 kg MS/cow, the LP reduced milking cow number rather than buy in feed to meet the increased feed demand from higher production per cow. At all production levels chosen between 305 and 415 kgMS/cow, it was most economic to dry off and cull cows early in dry summers to optimise feed demand vs. feed grown; use nitrogen (N) fertiliser to avoid a feed deficit only when response rates of better than 10 kgDM to 1 kg N could be expected; not use N for growing supplements to harvest. Pasture cover, within defined constraint levels, provided a buffer for feed demand and supply fluctuations. The study highlights the importance of assessing production, income and cost in an integrated framework to identify the point at which individual resources become limiting.},
	issn = {1176-5283},
	author = {Anderson WJ and Ridler BJ}
}
@conference {40987,
	title = {The effect of dairy herd management and milking practices on milk quality.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {56-60},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A mail survey to 200 dairy company suppliers in July 1996 received a 46\% response. Certain practices (e.g. SAMM (Seasonal Approach to Managing Mastitis) plan) reported by seasonal supply farmers were compared with their company{\textquoteright}s milk quality records for the 1995/96 year. An indicator of udder health was Bulk Milk Somatic Cell Count (BSCC). Mean BSCC (1995/96 lactation) for survey respondents was 217,000 cells/mL. 35\% achieved a seasonal average BSCC<150,000 cells/mL; 3\% had BSCC>400,000 cells/mL. Milksolids per hectare was significantly (p<0.01) and negatively correlated with BSCC. "Low BSCC" suppliers (<120,000 cells/mL) reported using similar dairy husbandry and milking procedures to the 65\% of suppliers with BSCC above 150,000 cells/mL. 45 \% with BSCC<250,000 cells/mL consciously used the SAMM plan compared to 22\% among those with BSCC>250,000 (p<0.05). Farm dairy hygiene, detection and treatment of mastitis infection (lactating or dry cow therapy), drying-off and culling of selected cows remain important practices for maintaining milk quality. },
	issn = {1176-5283},
	author = {Londono-Gutierrez P and Anderson WJ}
}
@conference {40359,
	title = {Optimization of {\textquoteright}herd-in-calf rate{\textquoteright} with respect to the length of the postpartum anoestrous period in Angus cows suckling calves},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {459-464},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A trial was undertaken to evaluate the effectiveness of the  CIDR-B in buffalo. Twenty four, 20 month old buffalo heifers had CIDR{\textquoteright}s  inserted (day 0) for 12 days. Each heifer was injected intramuscularly  with 10 mg of oestradiol benzoate at CIDR insertion and 150 IU of PMSG  at CIDR removal. Two buffalo bulls fitted with chin ball harnesses were  introduced into each of 2 groups of 12 heifers. Continuous observations  of mating activity commenced 24 hours after CIDR withdrawal. The  heifers were bled for progesterone analysis on days -20, -9, 0, 2, 7, 12  and 26.9 CIDR{\textquoteright}s (38\%) lost from the heifers were replaced immediately  after the losses were noticed. The mean interval from CIDR removal to  onset of mating activity was 50.3},
	issn = {1176-5283},
	author = {Pleasants AB and Barton RA and Morris ST and Anderson WJ}
}
