@conference {40282,
	title = {Oestrous behaviour and luteal function in anoestrous red deer hinds treated with a GnRH analogue or oestradiol},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {51},
	year = {1991},
	month = {Jan},
	pages = {55-62},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Five-year old Coopworth pregnant twin bearing ewes were  allocated to four periods of treatment which commenced either -4, 0, 6  or 12 weeks from lambing periods 1 to 4, respectively. Within each  period, pregnant ewes were further allocated to one of two groups (n+6)  one receiving 4000 Ostertagia(Teladorsagia)  circumcincta larvae per day for 30 days (MCI) or no infection  (NIC). All ewes were housed indoors and offered a pelleted diet.  Faecal egg counts, ewe liveweight, food intake, milk production and  serum pepsinogen were determined weekly. Wool growth, fibre diameter  and tensile strength were determined on wool grown within each  experimental period. Abomasal damage, as judged by serum pepsinogen,  occurred during all periods of infection. The magnitude of production  losses varied with time of challenge. Parasitism reduced milk  production by 10-59\% (p<0.01) and wool staple strength by 29-44\%  (p<0.01) with greatest effects on wool staple strength being recorded  during period 1. During lactation food intake (p<0.01) was reduced by  30\% in period 1 by parasitic infection but little effect was seen prior  to parturition. These data confirm that significant production losses do  occur in breeding ewes. The effects on ewe production of any larval  challenge will depend on the timing of the challenge will depend on the  timing of the challenge and on the susceptibility of the ewe to  infection at that time.  },
	issn = {1176-5283},
	author = {Duckworth JA and Barrell GK}
}
