Comparison of Uterine Involution and the Resumption of Ovarian Cyclicity between Lame and Sound Holstein Cows.
Authors: Praxitelous Anastasia, Katsoulos Panagiotis D, Tsaousioti Angeliki, Brozos Christos, Schmicke Marion, Boscos Constantin M, Tsousis Georgios
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Lameness during the postpartum period compounds reproductive delays in dairy cattle, particularly when combined with metabolic stress. Researchers compared 22 lame Holstein cows (lameness score 4 with hoof lesions) against 25 sound controls from 10 days before calving through 50 days post-partum, using serial ultrasonography and blood markers of ovarian function and energy status (progesterone, β-hydroxybutyrate, and non-esterified fatty acids). Lame cows demonstrated significantly delayed cervical and uterine horn involution, reduced ovulation rates (63.6% versus 88%), and elevated follicular pathology (36.4% versus 12% atresia or cyst formation by day 50), alongside higher circulating NEFAs on day 14 post-partum—a critical window for metabolic recovery. Elevated NEFAs independently suppressed normal cyclicity regardless of lameness status, but the combined burden of lameness plus metabolic insufficiency created a compounding effect on reproductive outcomes. For practitioners, this work underscores that managing lameness during the transition period and supporting energy balance through strategic nutrition and hoof care may be essential safeguards for fertility in postpartum dairy cows, suggesting that reproductive performance cannot be optimised in isolation from locomotor health.
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Practical Takeaways
- •Lameness during early postpartum period compromises reproductive recovery in dairy cows; addressing hoof health is essential for fertility outcomes
- •Energy status (NEFA levels) significantly impacts ovarian function independent of lameness; nutritional management is critical in transition period
- •The combination of lameness and poor energy balance creates compounding negative effects on reproduction; integrated management of locomotion and nutrition is necessary to optimize breeding outcomes
Key Findings
- •Lame cows had delayed cervical and uterine horn involution compared to sound cows (p=0.0003 and p=0.02 respectively)
- •Lame cows showed lower ovulation rates (63.6% vs 88%, p=0.05) and higher atresia/cyst formation (36.4% vs 12%, p=0.05)
- •High NEFA concentrations independently reduced ovulation rates (65.5% vs 94.4%, p=0.02) and normal ovarian activity (58.6% vs 88.9%, p=0.03)
- •Combined lameness and elevated NEFA showed interaction effects on ovulation rate and ovarian pathology through cumulative or synergistic mechanisms