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Articles by M.A. Alvarado
Total Records ( 2 ) for M.A. Alvarado
  R. Foroughbakhch , J.L. Hernandez-Pinero , M.A. Alvarado , Vazquez , A. Rocha Estrada and O.A. Gonzalez De Leon
  Information on nutritional complementation for cattle is necessary for the implementation of feed management systems capable to maintain or improve yield production. In order to determine the effectiveness of the use of Gleditsia seeds as feed complement a group of 6 castrated Merino sheeps were employed to measure the in vivo seed digestibility from 4 varieties: Milaud (MIL), Total (TOT), Super-M (SUM) and Voié-Ferré-Merchandise (VFM). Daily records of the amount of distributed, ingested, digested and rejected seeds as well as urine and feces were obtained for the calculation of the dry and organic matter balance, digested seeds balance, nitrogen balance and the coefficient of digestive utilization. The mean daily ingestion value per animal varied between 57-80 g of the dry matter of seeds/live weight0.75; the digestibility values varied considerably between individuals (33-99% of the DM; average 76%). The animals with a higher ingestion rate had a lesser digestion (CDU = 57.3%) than others with lesser ingestion (CDU = 67%). The nutrient content and digestion parameters of honeylocust seeds varied among sheep and varieties, being MIL and TOT higher in protein content than SUM and VFM. The animal weight gain was higher during the consumption period in the variety VFM (128 g day 1) compared to the SUM variety (96 g day 1). The seeds of honeylocust should be considered as different entities than other ingredients of the traditional diets when characterizing nutrient quality.
  R. Foroughbakhch , J.L. Hernandez-Pinero , R. Ramirez , M.A. Alvarado , M.H. Badii , A. Rocha and M.A. Guzman-Lucio
  In the semiarid and subtropical regions of northeastern Mexico, leaves and pods of Leucaena sp. are important forage complements into ruminant feeding. In order to determine the effectiveness of the use of Leucaena as fodder, samples of leaves of four species L. diversifolia, L. leucocephala, L. pulverulenta, L. shannoni and the hybrid L. leucocephala K743 were collected for estimation of some of their chemical characteristics, cell wall components, mineral composition, Volatile Fatty Acid (VFA) concentration and tannin and mimosine content. Results from chemical analysis revealed significant (p< 0.05) differences in nutrient values between species and hybrid of Leucaena. The highest value of crude protein (27.4%) and lowest ash content (7.9%) were exhibited by L. leucocephala K 743, while the highest NDF (38.5%) and ADF (26.8%) content were observed in L. pulverulenta and L. diversifolia. Low level of hemicellulose and soluble ash was observed in L. pulverulenta (7.3% and 0.11% respectively). The maximum mimosine content was observed in L. leucocephala (3.02%) and L. pulverulenta (2.91%). The VFA was higher in L. diversifolia (55.6mM) and L. leucocephala (51.5 mM) compared to L. pulverulenta (42.0 mM) and L. shannoni (48.3 mM). L. leucocephala had higher content of iron (115.5 ppm), lead (2.02 ppm) and aluminum (133.2 ppm) compared to others species, whereas, L. diversifolia showed the higher values in zinc (14.3 ppm), cobalt (0.06 ppm) and manganese (36.8 ppm). The leaves of Leucaena sp. should be considered as different entities than other ingredients of the traditional diets when characterizing nutrient quality.
 
 
 
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