Open Access. Powered by Scholars. Published by Universities.®
- Keyword
- Publication
- Publication Type
Articles 1 - 2 of 2
Full-Text Articles in Other Nutrition
Effect Of Brown Midrib Corn Silage And Dried Distillers Grains Plus Solubles On Lactational Performance And Nitrogen Utilization By Dairy Cows, Hugo A. Ramirez
Effect Of Brown Midrib Corn Silage And Dried Distillers Grains Plus Solubles On Lactational Performance And Nitrogen Utilization By Dairy Cows, Hugo A. Ramirez
Department of Animal Science: Dissertations, Theses, and Student Research
Thirty six Holstein cows, four ruminally cannulated, (mean ± SD, 111 ± 35 DIM; 664 ± 76.5 kg BW) were used in replicated 4×4 Latin squares to investigate the effects of brown midrib (bm3) and conventional (DP) corn silages, and the inclusion of dried distillers grains plus solubles (DDGS) on milk production and N utilization. In each 28 d period cows were assigned to one of four treatments: DP plus 0% DDGS (CON); bm3 plus 0% DDGS (BMR); DP corn silage plus 30% DDGS (DP+DG); and bm3 plus 30% DDGS (BMR+DG). Dry matter intake was greater (P < 0.01) for cows consuming bm3 (25.8 VS 24.4 ± 0.47 kg), likewise for DDGS (24.3 and 25.9 ± 0.47 kg/d for 0 and 30%). Compared to DP hybrid, NDFD was higher (P < 0.01) for bm3 (32.5 VS 38.1 ± 1.79%). There was a hybrid × DDGS interaction (P < 0.01) for total concentration of volatile fatty acids (VFA) and rumen pH as the highly digestible treatment BMR+DG resulted in the highest VFA and the lowest pH. Milk yield was not affected by treatment and averaged 30.6 ± 1.09 kg/d. Milk protein yield (MPY) was greater (P < 0.01) for bm3 and DDGS treatments. There was a hybrid by DDGS interaction (P = 0.02) for milk fat yield (MFY) resulting in 1.03, 1.08, 0.84 and 0.78 ± 0.045 kg/d for DP, BMR, DP+DG and BMR+DG. Fat corrected milk (FCM) was affected by DDGS (P < 0.01) and averaged 30.0 and 26.4 ± 1.0kg/d (0% and 30% inclusions). Urinary N excretion was similar among treatments; however fecal N was lower (P = 0.03) for diets containing bm3 corn silage which caused lower (P = 0.02) manure N. These results indicate that bm3 corn silage and DDGS increase DMI, NDFD and MPY; however high inclusion of corn silage with 30% DDGS reduces FCM. Nitrogen excretion was reduced when cows consumed bm3.
Evaluación De La Estabilidad De La Leche Y Su Relación Con El Porcentaje De Proteína En Dos Hatos De La Sabana De Bogotá, Luis Alberto Benítez Morales, Germán Alejandro Ordoñez Lozano
Evaluación De La Estabilidad De La Leche Y Su Relación Con El Porcentaje De Proteína En Dos Hatos De La Sabana De Bogotá, Luis Alberto Benítez Morales, Germán Alejandro Ordoñez Lozano
Zootecnia
La investigación se llevó a cabo en dos fincas de la sabana de Bogotá con el objetivo de evaluar la relación existente entre la estabilidad proteica y su contenido porcentual en la leche. Se emplearon 30 vacas divididas en 15 animales para cada una de las fincas, se dividieron los animales en tres grupos de acuerdo a su etapa de lactancia. Se tomaron 180 muestras y los datos obtenidos en las distintas evaluaciones fueron analizadas mediante el programa estadístico Statgraphic donde se realizó el análisis de correlaciones lineales de Pearson, para ver el nivel de asociación entre las variables: proteína, …