Melendez Pedro, Gomez Veronica, Bothe Hans, Rodriguez Francisco, Velez Juan, Lopez Hernando, Bartolome Julian, Archbald Louis
College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA.
College of Veterinary Medicine, University of Florida, Gainesville, FL 32611, USA.
J Vet Sci. 2018 May 31;19(3):462-467. doi: 10.4142/jvs.2018.19.3.462.
The objective of this study was to compare ovulation rate, number of large ovarian follicles, and concentrations of plasma progesterone (P4) and non-esterified fatty acids (NEFA) between lame (n = 10) and non-lame (n = 10) lactating Holstein cows. The study was conducted in an organic dairy farm, and cows were evaluated by undertaking ultrasonography and blood sampling every 3 days from 30 days postpartum for a period of 34 days. Cows which became lame during the first 30 days postpartum experienced a lower ovulation rate determined by the presence of a corpus luteum (50% presence for lame cows and 100% for non-lame cows, ≤ 0.05). The number of large ovarian follicles in the ovaries was 5 for lame cows and 7 for non-lame cows ( = 0.09). Compared to non-lame cows, lame cows had significantly lower ( ≤ 0.05) concentrations of plasma P4. Furthermore, NEFA concentrations were lower ( ≤ 0.05) in lame cows than in non-lame cows. It is concluded that lameness in postpartum dairy cows is associated with ovulation failure and lower concentrations of P4 and NEFA.
本研究的目的是比较跛足（n = 10）和非跛足（n = 10）的泌乳荷斯坦奶牛之间的排卵率、大卵泡数量以及血浆孕酮（P4）和非酯化脂肪酸（NEFA）的浓度。该研究在一个有机奶牛场进行，从产后30天开始，每3天对奶牛进行超声检查和采血，为期34天。产后前30天内出现跛足的奶牛，根据黄体的存在情况确定排卵率较低（跛足奶牛为50%，非跛足奶牛为100%，P≤0.05）。跛足奶牛卵巢中的大卵泡数量为5个，非跛足奶牛为7个（P = 0.09）。与非跛足奶牛相比，跛足奶牛的血浆P4浓度显著较低（P≤0.05）。此外，跛足奶牛的NEFA浓度低于非跛足奶牛（P≤0.05）。研究得出结论，产后奶牛跛足与排卵失败以及P4和NEFA浓度降低有关。
