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Articles by R.F. Garcia-Castillo
Total Records ( 2 ) for R.F. Garcia-Castillo
  J. Salinas-Chavira , M. Dominguez-Munoz , R. Bernal-Lorenzo , R.F. Garcia-Castillo and C. Arzola-alvarez
  The effects of diets containing Dried Pig Manure (DPM) and Dried Rumen Contents (DRC) on growth performance and carcass characteristics were examined in lambs. Sixteen intact male Pelibuey×Dorper lambs weighing 23.8±1.9 kg were housed in individual pens for a 60-day feeding trial and were assigned randomly into four treatment diets in a 2×2 factorial design, based on the addition of 15% DPM and/or 4% DRC: T1 no addition (control); T2 DPM only; T3 DRC only; and T4 both DPM and DRC. All diets were formulated to contain 14% CP and 2.6 Mcal ME kg 1 DM. At the end of the trial, carcass images were recorded in the last intercostal space (12-13th ribs) using ultrasound to measure the Longissimus dorsi area muscle and subcutaneous fat. Daily dry matter intake was lower (p< 0.05) in animals consuming DPM plus DRC, compared to animals consuming only DPM or DRC, but similar to the control group; DMI was 941, 1077, 1015 and 952 g, for T1 to T4, respectively. Average daily gain (227, 209, 214 and 188 g, respectively) and feed efficiency (5.37, 5.54, 5.44 and 6.02, respectively) were similar (p>0.05) between groups. Moreover, subcutaneous fat (0.31, 0.29, 0.29 and 0.24 cm, respectively) and Longissimus dorsi area (15.37, 15.32, 15.66 and 14.47 cm2, respectively) showed no significant difference (p>0.05) between lambs fed the four diets. In conclusion, feed consumption was depressed in the diet with pig manure plus rumen contents, however, weight gain or carcass characteristics were not influenced by the inclusion of pig manure and/or rumen contents in their diets.
  R.F. Garcia-Castillo , Sh.D. Chávez-Hernández , J. Salinas-Chavira , J.E. Garcia-Martinez , J.R. Kawas-Garza and J.M. Fuentes-Rodriguez
  It was evaluated the influence of diets with different ratio of whole:ground sorghum grain on growth performance of feedlot lambs. Seventeen castrated males Rambouillet x Suffolk lambs of 20±5 kg initial weight were randomly assigned to 3 treatments (T) containing different proportions of ground (G) and whole (W) sorghum grain, T1 = 100 G: 0W; T2 = 50G: 50 W and T3 = 0 G: 100 W. Lambs were weighed at the beginning of and every 15 days to estimate daily weight gain. Offered and refused feed was weighed daily to determine feed consumption. Feed efficiency was determined as daily DM consumption divided by daily weight gain. The experimental period lasted 60 days. Daily feed consumption, weight gain or feed efficiency were not affected by treatments (p>0.05), except for feed consumption from 31-60 days period, in which whole sorghum grain treatments (T2, T3) were higher (12%; p<0.05) than the ground sorghum grain treatment (T1). It is concluded that whole sorghum grain may replace part or all the ground sorghum grain in diets, without affecting the productive performance of feedlot lambs.
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