@conference {40696,
	title = {Cortisol response to ACTH in lambs selected for or against fatness: Effects of maturity and fasting},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {150-153},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Lambs grazing the tannin containing pasture species Lotus  corniculatus (cv Goldie) were compared with lambs grazing a high  endophyte ryegrass (cv Nui) in order to assess the effectiveness of lotus at  reducing dags and flystrike. Two trials of the same design were run  consecutively, between January and April 1994. Each of 4 paddocks, 2 of  lotus and 2 of ryegrass, were set stocked for 32 and 42 days (respectively for  trials 1 and 2) with 62 lambs. Half of the lambs in each paddock were  drenched fortnightly with a combination anthelmintic. Lambs were  examined for flystrike three times each week and samples were collected for  fly identification before strikes were treated with insecticide.   Lambs which grazed lotus suffered less flystrike than those grazed on  ryegrass in both trials (32\% of 51\%; P<0.01 and 1.5\% cf 7.4\%; P<0.05 for  trials 1 and 2 respectively). Drenching reduced flystrike in trial 1 (from 57\%  to 26\%; P<0.01), but not in trial 2 (4.8\% cf 4.1\%; NS). Flystrike was  strongly correlated with dagginess (R2=97\%). Mean dry weight of dags was  reduced by grazing lotus rather than ryegrass (79g cf 108g; P<0.01 in trial 1  and 9.7g cf 14.3g; NS in trial 2) and by drenching (68g cf 118g; P<0.01 in  trial 1 and 8.8g cf 15.2g; NS in trial 2). Lambs grazing lotus had  significantly (P<0.01) higher faecal dry matter content than those grazing  ryegrass. We conclude that lotus has considerable potential for a future role  in the integrated management of flystrike and dags.  },
	issn = {1176-5283},
	author = {Veenvliet BA and Littlejohn RP and Stuart SK and Suttie JM}
}
@conference {40733,
	title = {Growth Hormone (GH) secretory patterns in genetically lean and fat sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {55},
	year = {1995},
	month = {Jan},
	pages = {272-274},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The pattern of GH secretion was studied in Coopworth sheep which  have been selected for low (Lean) or high (Fat) ultrasonic backfat depth over  15 years. At each of two developmental stages (February and May) Lean and  Fat ram lambs were fed ad libitum or fasted for 48 hours (n=6 per treatment).   Animals were blood sampled via an indwelling jugular cannula every 10  minutes for six hours, then slaughtered and the pituitary glands removed and  weighted.   Mean GH was greater for Lean than Fat animals (2.82 versus 1.42 ng/ml,  p<0.001), in February than in May (2.47 versus 1.62 ng/ml, p<0.001) and for  fasted than fed animals (2.48 versus 1.62 ng/ml, p<0.001). Analysis of GH  secretory patterns showed that peak frequency for Lean animals was more  than twice that for Fat animals (2.64 versus 1.17 peaks/6 hours, p<0.001).   There was no difference in the peak amplitude. In line with their higher GH  concentrations, Lean animals had significantly heavier pituitaries than Fat  animals (0.74 versus 0.52 g, p<0.001).   Selection for leanness in Coopworth sheep has altered the GH secretory  pattern of the animals. The pituitary weight may explain some of these  changes in GH secretion.  },
	issn = {1176-5283},
	author = {Francis SM and Veenvliet BA and Littlejohn RP and Stuart SK and Suttie JM}
}
