@conference {39160,
	title = {The use of return interval pattern to indicate dairy herd infertility problems},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {23},
	year = {1963},
	month = {Jan},
	pages = {88-99},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Castle OM}
}
@conference {38971,
	title = {Selection Through the Herd Sire},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {12},
	year = {1952},
	month = {Jan},
	pages = {40-48},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	issn = {1176-5283},
	author = {Castle OM}
}
