Efectos de diferentes niveles de enzimas en la producción de vacas holstein mestizas en el primer tercio de lactancia.

Abstract

The investigation of the "effects of different enzyme levels on the production of crossbred holstein cows in the first third of lactation" was carried out at the Pucate farm located in the Julquis area of the Chambo town, Chimborazo province. The effect of enzyme levels (25 and 50 gr of enzyme) on the production of crossbred Holstein cows in the first third of lactation was evaluated to be compared with a control treatment. The size of the experimental unit was 1 cow per repetition, giving a total of 15 lactating cows; They were distributed under a completely randomized design, evaluating different productive parameters and chemical characteristics of the milk during 60 days of research, the statistical analyses were analyzed with Infostat version (2021) and Excel 2019. The experimental results were subjected to analysis of variance and separation of means with Duncan's test. It was determined that in the evaluation at 30 days the best results were obtained with 25 g of enzyme, with a percentage of fat of 1.41%, fat solids of 8.16%, protein 3.07% density of 1.0294 g/ml and solids of 9.57%; with the same tendency in the evaluation at 60 days the results obtained were fat with 2.12%, protein of 3.13%, density of 1.0293 g/ml and total solids with 10.26%. With reference to the cost-benefit ratio, the 25 g of enzyme reached a cost-benefit of 1.50 with a profitability of 50%. Therefore, the use of 25 g of enzyme in the daily diet of cows in the first third of lactation in crossbred Holstein cows is recommended.