Castillo Alejandro R, Rienzo Julio A Di, Cavallini Damiano
University of California, Cooperative Extension, Merced, CA. 95340, USA.
Facultad Cs. Agropecuarias, Universidad Nacional de Córdoba. 5000, Argentina.
Vet Anim Sci. 2025 Feb 24;27:100434. doi: 10.1016/j.vas.2025.100434. eCollection 2025 Mar.
A commercial dairy farm with two dairy units (about 3000 cows each), similar management and diets was used to evaluate the effect of a feed additive based on a mix of condense and hydrolysable tannins (ByPro®) on lactating cow services per conception and days open. The experiment was divided in three evaluation periods. Period I, January-March (without-feed additive), Period II, April-September, all cows in one dairy unit received the mix-tannins feed additive at 0.3 % of the total estimated DMI per cow. Period III, October-December (without-feed additive). Services per conception was modeled as a Poisson count using a generalized linear model with log link function. Days open was modeled with a generalized linear model for a gamma variable with log link function. The models included: dairy units (2), periods (3), and their interactions. No significant differences were observed in Period I. During the evaluation Period II, the mix tannins feed additive increased the artificial insemination efficiency, reducing ( < 0.01) the number of services of conception (- 9 %), from 2.20 to 2.02 and days open ( < 0.01) from 92.5 to 87 days (- 6.3 %). Comparable significant effects were observed in Period III without the mix-tannins feed additive that might be related to possible rumen microbiota carried over effects of the cows consuming the mix-tannins for 6 months. Finally, the treatment improved performances on the conception rate and pregnancy rate. The mix of condensed and hydrolysable tannins feed additive (ByPro®) improved reproduction efficiency in lactating cows, by reducing services per conception number and days open.
一个拥有两个奶牛养殖单元（每个单元约3000头奶牛）、管理和日粮相似的商业化奶牛场，用于评估一种基于浓缩单宁和水解单宁混合物（ByPro®）的饲料添加剂对每受孕泌乳母牛配种次数和空怀天数的影响。实验分为三个评估期。第一期，1月至3月（无饲料添加剂）；第二期，4月至9月，一个奶牛单元的所有奶牛按每头奶牛估计总干物质摄入量的0.3%添加混合单宁饲料添加剂；第三期，10月至12月（无饲料添加剂）。每受孕配种次数采用具有对数链接函数的广义线性模型作为泊松计数进行建模。空怀天数采用具有对数链接函数的伽马变量广义线性模型进行建模。模型包括：奶牛养殖单元（2个）、时期（3个）及其相互作用。在第一期未观察到显著差异。在评估的第二期，混合单宁饲料添加剂提高了人工授精效率，显著降低（P<0.01）受孕配种次数（-9%），从2.20次降至2.02次，空怀天数也显著减少（P<0.01），从92.5天降至87天（-6.3%）。在第三期，没有混合单宁饲料添加剂时也观察到了类似的显著效果，这可能与奶牛食用混合单宁6个月后瘤胃微生物群可能产生的残留效应有关。最后，该处理提高了受孕率和妊娠率。浓缩单宁和水解单宁混合饲料添加剂（ByPro®）通过减少每受孕配种次数和空怀天数，提高了泌乳母牛的繁殖效率。
