@conference {40941,
	title = {Non-invasive pregnancy determination in mares by enzymeimmunoassay of estrone sulphate concentrations in faeces.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {57},
	year = {1997},
	month = {Jan},
	pages = {234-236},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Measurement of faecal estrone sulphate by enzymeimmunoassay was evaluated as a non-invasive means of monitoring pregnancy status in mares. Faecal samples from non-pregnant mares had a mean {\textpm} s.e.m. estrone sulphate concentration of 23 {\textpm} 0.9 ng/g (N=242). In pregnant mares, mean faecal estrone sulphate concentrations increased progressively during the first half of gestation. The values rose from a mean {\textpm} s.e.m. of 49 {\textpm} 4 ng/g (N=121) for samples collected <80 days post-mating, to 122 {\textpm} 9 ng/g (N=30) for samples collected 161 to 180 days post-mating. Thereafter, faecal estrone sulphate concentrations remained relatively constant for the remainder of pregnancy. From 150 days post-mating onwards, <2\% of faecal samples from pregnant mares had an estrone sulphate concentration below 66 ng/g which was the value 3 standard deviations above the mean value found for non-pregnant mares. Following foaling or foetal death, faecal estrone sulphate concentrations returned quickly to non-pregnant levels. Using this estrone sulphate enzymeimmunoassay, mares may be confirmed pregnant once faecal estrone sulphate concentrations rise above the 66 ng/g cut-off value. Those mares in which faecal estrone sulphate concentrations have not risen above 66 ng/g by 150 days post-mating may be considered to be non-pregnant. Measurement of faecal estrone sulphate thus offers a convenient, non-invasive means of monitoring pregnancy status. },
	issn = {1176-5283},
	author = {Henderson KM and Perkins NR and Wards RL and Stewart JI}
}
@conference {40212,
	title = {Comparison of commercial gonadotrophins using bioassays},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {50},
	year = {1990},
	month = {Jan},
	pages = {161-166},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {The immune response of sheep to nematode parasites involves a   cascade of events beginning with the recognition of nematode antigen,   followed by stimulation of the immune system to elicit the appropriate   cellular response at the gut mucosa and finally the release of products   which promote the elimination of the parasite from the gut. These   processes are examined and deficiencies in the knowledge are   highlighted. The application of the knowledge of the sheeps{\textquoteright} immune   system to the identification of a marker for resistance and   opportunities for the control of nematodes through manipulation of   sheeps{\textquoteright} responsiveness are discussed.     The progress that has been achieved in the experimental breeding of   sheep for nematode resistance is examined. The use of such valuable   scientific resource flocks for studies which advance the understanding   of the immunology of resistance is discussed.    },
	issn = {1176-5283},
	author = {Henderson KM and Weaver A and Wards RL and Lun S and McNatty KP}
}
