@conference {40410,
	title = {Measurement of foetal size by ultrasonography and progesterone concentrations in pregnant alpacas},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {52},
	year = {1992},
	month = {Jan},
	pages = {191-194},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A high fleece weight Romney breeding flock (HFW) and a  contemporary random control flock (RC) has been established at MAF  Technology Woodlands Research Station by the intensive screening of ewe  and ram hoggets from commercial flocks. This paper summaries production  traits including reproductive performances, liveweight and fleece weight  of the ewe flocks over the 7 years.   The ovulation rate and number of multiple births per ewe lambed were  higher for HFW than RC ewes 1.84 vs 1.75 (SE0.02, p<0.01) and 0.62 vs  0.56 (0.02, p<0.05). Number of lambs born per ewe joined, number of  lambs reared per ewe lambed, the number of lambs weaned per lamb born  and number of lambs weaned per ewe joined in HFW were 1.49 (SE0.02),  1.37 (0.02), 0.84 (0.01) higher in HFW (65.4kg; SE2.4) than in RC (61.3  kg; 2.4). The greasy fleece weight averaged 4.55 kg (SE 0.21) for HFW  and 3.87 kg (0.21) for RC. This represents an average advantage of  17.6\% (P<0.001) to HFW over 7 production years. The results indicate  that the single trait selection for fleece weight will be associated  with increases in other important productive traits in long woolled  sheep.  },
	issn = {1176-5283},
	author = {Ridland M and Knight TW and Wyeth TK}
}
