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Relationships of peri-partum, plasma concentrations of progesterone, oestrogens and 13,14-dihydro-15-ketoprostaglandin F2alpha in heifers and of anatomical measurements of dam and calf with difficulty of calving in early-bred Hereford x Friesian heifers.
Olujohungbe AA, Bryant MJ, Cobby JM, Pope GS. Olujohungbe AA, et al. Among authors: cobby jm. Anim Reprod Sci. 1998 Jun 30;52(1):1-16. doi: 10.1016/s0378-4320(98)00078-5. Anim Reprod Sci. 1998. PMID: 9728810
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