@conference {41816,
	title = {High crude protein in autumn pasture does not impair reproductive performance in sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {68},
	year = {2008},
	month = {Jan},
	pages = {156-157},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Brisbane, Australia},
	abstract = {Embryos exposed to ammonia may degenerate or their growth enhanced (McEvoy et al., 1997). Kelly (1982) reported reproductive wastage of 24.9\% in South Island sheep. New Zealand pastures contain high concentrations of crude protein (Chaves et al., 2002) but whether reproductive wastage can partly be explained by ammonia and/or urea toxicity from high protein pasture is unknown. The aims of the present study were to determine the effect of plasma urea concentration on ovulation rate, embryo survival, conception rate and lamb birth weight in ewes joined with the ram on ...Continued },
	issn = {1176-5283},
	author = {Madibela OR and Nicol AM and Sykes AR and Jay NP}
}
@conference {40084,
	title = {A comparison of ultrasound backfat measurements on sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {48},
	year = {1988},
	month = {Jan},
	pages = {33-36},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Mating records from Dairy Board files for 1984 were analysed. First inseminations with liquid semen were considered, and the effect of several factors on conception analysed. Conception was scored as 1 if a calving occurred 272 to 293d after insemination, and 0 if a calving occurred outside that interval. Only records from animals with a known calving date were included. The data were analysed by linear model techniques, with conception as a dependent variable. The factors contributing to variation in conception were (in order of declining importance): herd, technician, post-partum interval, service sire and age of cow. The R2 was 0.072 indicating that most of the variation is caused by binomial error.},
	issn = {1176-5283},
	author = {Nicol AM and Jay NP and Beatson PR}
}
@conference {39966,
	title = {Ewe maternal behaviour score and lamb survival},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {45},
	year = {1985},
	month = {Jan},
	pages = {159-162},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Data on live weight (LW) and condition score (CS) were collected in a large scale breed evaluation at Goudies (Department of Lands and Survey, Rotorua). The LW data were obtained 4 times a year; the CS data on a 1 to 10 scale similar to the Ellinbank scale (10 fattest), were obtained on 7 occasions from April 1982 to February 1984. Seven breed groups, 5 2-breed crosses and 2 straightbreds (Angus and Herefords), were compared. The crosses were Hereford-Angus (HA, including its reciprocal), South Devon-Angus (Sd.A), Friesian-Angus (FA), Friesian- Hereford (FH) and Jersey-Angus (JA). Breed differences for LW and CS were reasonably consistent between years or seasons, in spite of large year effects and significant breed x age interactions. The CS means for JA, FA and FH were 0.9, 0.5 and 0.6 units less than for Angus cows, which in turn were 0.3 and 0.7 units lower than HA and Herefords respectively. The scores of Sd.A cows were near the average of the 7 groups together, but they were heaviest, being 22 kg above the herd mean.  It is suggested on the basis of this evidence that using the same target for LW or CS for different breed crosses is unrealistic. Within breed and age groups, the correlation between August and November CS was 0.43. The equivalent figure for LW was 0.84. For each unit increase in CS, LW rose by 25.2 kg (r=0.53, range 0.42 to 0.60 on different recording occasions.},
	issn = {1176-5283},
	author = {O{\textquoteright}Connor CE and Jay NP and Nicol AM and Beatson PR}
}
@conference {39479,
	title = {Comparative production of Romney sheep grazed with and without access to drinking water},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {35},
	year = {1975},
	month = {Jan},
	pages = {150},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Clark VR and Jay NP}
}
