@conference {41503,
	title = {Effect of ergot alkaloids on liveweight gain and urine lysergol level in ewe hoggets and heifers},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {64},
	year = {2004},
	month = {Jan},
	pages = {192-196},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Hamilton},
	abstract = {Ingestion of ergot alkaloids can reduce live-weight gain (LWG) in sheep and cattle. The objective of this experiment was to determine if the enzyme-linked immunosorbent assay (ELISA) for urinary lysergol level provided an accurate measure of ergot alkaloid dietary intake. Forty hoggets and 60 heifers were fed ryegrass seed containing ergovaline (EV) (0.0 to 75.0 {\textmu}g EV/kg LW hogget; 0.0 to 35.0 {\textmu}g EV/kg LW heifer) daily. The feeding trial was repeated after 30 days for the hoggets. Urine lysergol:creatinine ratio increased linearly for hoggets from 1.91 to 5.80 (P<0.001) and LWG was linearly suppressed from 110 to 60 g/d (P<0.01) and 30 days later, from 35 to -130 g/d (P<0.05) for intakes of 0.0 to 75.0 {\textmu}g EV/kg LW. Heifer urine lysergol:creatinine ratio increased linearly from 1.60 to 5.21 and LWG declined from 1.0 to 0.85 kg/d for intakes of 0.0 to 35.0 {\textmu}g EV/kg LW (P<0.05). Urinary lysergol:creatinine ratio increased by 0.056 {\textpm} 0.007 (P<0.001, r2 = 0.67) in hoggets and by 0.082 {\textpm} 0.006 (P<0.001, r2 = 0.77) in heifers, for every 1 {\textmu}g EV/kg LW consumed. These studies demonstrated a strong relationship between ergot alkaloid dietary intake and urine lysergol:creatinine ratio. },
	issn = {1176-5283},
	author = {Layton DL and Fletcher LR and Litherland AJ and Scannell MG and Sprosen J and Hoogendoorn CJ and Lambert MG}
}
@conference {40316,
	title = {Plasma hormone concentrations in pasture-fed Friesian cows treated with recombinantly-derived bovine somatotropin (bST)},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {235-238},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Dairy farmers often debate the importance of liveweight of  rising 2 year old heifers and the value of various heifer wintering  systems on subsequent production. Lifetime performance of all dairy  cows born on the Taranaki Agricultural Research Station have been  recorded since 1978 on a computerised data base. This data base was  utilised to determine the liveweight gain of heifers and cows over  winter and the effects of this on production in the following season.   Initial analysis of the data showed a significant (P<0.01) age effect on  winter liveweight gain within a mixed age herd of cows. The average  liveweight gain over eight years of the older cows (4 yr +) was 3 times  that of the rising 2 year olds. Further analysis showed a significant  (P<0.05) age effect on the relationship between liveweight at calving  and production of milkfat in the following season. Higher liveweight at  calving resulted in a greater increase in production for 2 year olds  than for older cattle. The conclusion to be drawn from this is that  wintering rising 2 yea old heifers separately from older cows to achieve  higher liveweight may have beneficial effects on the following seasons  production.   A field trial in winter 1990 to test this assumption showed the winter  liveweight gain of rising 2 year old heifers and mature cows, offered  the same herbage allowance, was significantly (P<0.01) higher when  wintered separately than wintered as a mixed age herd. Subsequent milk  solids production from the two-wintering systems was the same despite  different liveweight at calving. Aspects of herd behaviour were  suggested as the cause of the nil response.  },
	issn = {1176-5283},
	author = {McCutcheon SN and Hoogendoorn CJ and Lynch GA and Wickham BW and Breier BH and Gluckman PD}
}
@conference {40046,
	title = {Pasture quality and animal performance over late spring and summer},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {47},
	year = {1987},
	month = {Jan},
	pages = {31-33},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The impact of a facial eczema outbreak on ewe performance, and its link to pasture conditions, was assessed within a farmlet experiment that investigated aspects of managing pasture surpluses in hill country.  Late disposal of lambs and grazing steep land during periods of high spore numbers increased facial eczema in ewes. These effects can be associated with grazing lower pasture masses. In addition to clinical facial eczema deaths, there was a 2 - 3\% increase in barren ewes and a 5-7\% reduction in multiple births for every 100 i.u. increase in serum gamma glutamyl transferase levels.  Pithomyces chartarum spore numbers were highest in easy contoured and north to north-west facing paddocks and in ryegrass dominant microsites.  Numbers were least in south to south-west facing paddocks and in pastures dominated by low quality herbage and/or low fertility demanding grass species. The effects of facial eczema may well be reduced, but not necessarily eliminated, if the variability in potential toxicity is understood and wisely managed.},
	issn = {1176-5283},
	author = {Butler BM and Hoogendoorn CJ and Richardson MA}
}
