"Determinación del valor nutricional y la degradabilidad ruminal IN SITU de dos variedades de maiz (zea maysl) como forraje, en dos densidades y diferentes edades de corte, en Lodana del cantón Santa Ana"

Abstract

The following work was developed in the Department of Animal Production of the Faculty of Veterinary Sciences, of the Technical University of Manabí and had as objective the determination of the nutritional value of two varieties of corn (zea mays l.) DK-7088, ALT- 200, as forage, in two planting densities (100,000 and 125,000 plants / ha), said forage was planted in four plots distributed as follows, DK-7088 - 125,000 (D1 V1), DK-7088 - 100,000 (D1V2) , ATL -200 125,000 (D1V2), ATL-200 -100,000 (D2V2); Five cuts were made at different plant growth ages (25, 40, 60, 80 and 100 days), with block design change with factorial arrangement 5x2x2. The bromatological quality of Crude Protein (PC), Ashes, Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF) was analyzed and subsequently the in situ ruminal degradability was evaluated, which was carried out at two fistulated cows, with times of 3, 6, 12, 24. 48, 72, hours, with 3 repetitions each treatment. The results of bromatología showed that the best variety was the ATL-200 with better results in PC with 18,33%, and in the NDF 74,09%; in FDA it was 54.12%, in ash 11.43%, in ENL 0.57 Mcal / kg and in hemicellulose the highest being with an average of 22.51%. Regarding in situ ruminal degradability at 48 hours at the 60-day cut, it was different from the rest (p <0.001) with an average of 86.32% being the best; In the varieties there were also significant differences, the best being the DK-7088 with 83.27% (p <0.001). On the other hand, when analyzing the densities, they behaved very similar, also interaction between cut, variety and density was found (p <0.002 ). Also at 72 hours the best cut was at 60 days with a degradability of 95.44% (p <0.001) being different from the rest; as far as the varieties exist significant differences being the best DK-7088 with 90.23% (p <0.001); while in the density it was better than 100,000 plants per hectare with 90.07%; Although the ATL -200 variety is better at a nutritional level, the variety DK-7088 is recommended because it is better absorbed at the ruminal level, being a supplement for bovine feeding; The best planting plot is the DK-7088 and 125,000n (D1V1) plant / hect with 60 cutting days. KEY WORDS: Degradability, FDN, FDA, in situ, fistuladas.