@conference {40606,
	title = {Reproductive performance of ewes after grazing on G27 red clover, a low formononetin selection in cultivar Pawera.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {54},
	year = {1994},
	month = {Jan},
	pages = {231-234},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {One hundred and fifty ewes grazed either on a high oestrogenic red clover  
(Pawera), or a new, low oestrogenic selection of red clover (G27), or control  
pastures before mating.  The treatment groups (n = 25) and grazing lengths  
prior to mating were (1) Pawera, 6 weeks; (2) G27, 6 weeks; (3) G27, 12  
weeks; (4) G27/Ryegrass-white clover (rg-wc), 6 weeks/6weeks; (5) Rg-wc  
(control 1), 6 weeks, and (6) White clover (control 2), 6 weeks.  The ewes were  
mated as one group on rg-wc pasture immediately after the grazing treatments.   
Formononetin concentration was significantly lower in G27 (0.26\%) than in  
Pawera red clover (0.55\%) (P<0.05).  Ovulation rates in ewes after the first  
service were similar for all treatment groups (P<0.05).  The incidence of return  
to service was significantly higher in Pawera ewes (72.7\%) than in any of the  
other groups (P<0.01).  The return rates for the other groups were 33.3\%  
(G27/6weeks), 25.0\% (G27/12 weeks), 4.8\% (G27/rg-wc), 9.5\% (rg-wc) and  
14.3\% (white clover).  Most ewes which were mated at the next two cycles  
became pregnant.  It is concluded that the fertility in the ewes grazing G27 red  
clover was better than that in ewes grazing Pawera red clover, however there  
may have been some impairment in contrast to animals grazing control pasture. },
	issn = {1176-5283},
	author = {McDonald MF and Anwar M and Keogh RG}
}
