Brickell, J. S., Pollott, G. E., Clempson, A. M., Otter, N., & Wathes, D. C. Polymorphisms in the bovine leptin gene associated with perinatal mortality in Holstein-Friesian hiefers. JOURNAL OF DAIRY SCIENCE, 93(1), 340-347. https://doi.org/10.3168/jds.2009-2457