@article {ibrahim2009genetic,
	title = {Genetic and phenotypic trends of calving interval and age at first calving in a commercial Holstein herd.},
	journal = {Egyptian Journal of Animal Production},
	volume = {46},
	number = {2},
	year = {2009},
	note = {n/a},
	pages = {103{\textendash}112},
	publisher = {Egyptian Society of Animal Production},
	abstract = {n/a},
	author = {Ibrahim, MAM and Rushdi, H.E. and Abdel-Salam, SAM and Abou-Bakr, S}
}
