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Articles by J.G. Herrera
Total Records ( 2 ) for J.G. Herrera
  M. Becerril , C. Lemus , J.G. Herrera , M. Huerta , M. Alonso-Spilsbury , R. Ramirez-Necoechea , D. Mota-Rojas and J. Ly
  A 2x2 factorial arrangement was used for evaluating carcass traits and meat quality of 22 Yorkshire x Landrace (YL) and 13 Pelón Mexicano (PM) castrate male and female pigs 63 days old which were allotted at random during 16 weeks into 2 rearing systems consisting of total (15 and 7 pigs) or partial confinement (7 and 6 pigs). Partial confinement included rearing animals outdoors in a grass prairie (Brachiaria brizantha) from 9-16 h. There were no significant differences (p<0.05) for the interaction rearing system x genotype in any measurement conducted throughout this experiment. Highly significant (p<0.001) differences between genotypes was encountered for carcass yield and primary cuts adjusted to slaughter weight as covariable. However, carcass yield expressed as percentage of slaughter weight only tended (p<0.103) to favour YL pigs. Differences between rearing systems were less marked, with better carcass traits in either totally confined YL animals or partially confined PM pigs. The genotype effect was at least significantly (p<0.01) different in all measurements indicating a higher fat content in carcasses of PM pigs, when compared to YL animals. Length of some reservoir digestive organs were significantly (p<0.001) higher in PM than in YL pigs. There were no significant differences (p>0.05) in meat quality indices, including meat pH, water holding capacity, color and marbling. It is considered that a total or partial confinement, consisting on daily grazing outdoors, rearing system, has less influence on carcass traits in pigs when Pelón Mexicano and Yorkshire x Landrace pigs are compared.
  M. Becerril , C. Lemus , J.G. Herrera , M. Huerta , M. Alonso-Spilsbury , R. Ramirez-Necoechea , D. Mota-Rojas and J. Ly
  A 2x2 factorial arrangement was used for evaluating performance traits during 16 weeks in 2 groups of 22 Yorkshire x Landrace (YL) and 13 Pelón Mexicano (PM) castrate male and female pigs 63 days old which were allotted at random into 2 rearing systems consisting of total (15 and 7 pigs) or partial confinement (7 and 6 pigs). Partial confinement included rearing animals outdoors in a grass prairie (Brachiaria brizantha) from 9:00-16:00 h. No significant differences (p<0.05) for the interaction rearing system x genotype were found in any measured performance trait. It was observed that treatments involving Yorkshire x Landrace animals had a high significant (p<0.001) live weight at any age, as compared to the PM pigs. It was evident that YL pigs had a higher daily feed intake than PM animals and on the other hand, results from animals in confinement clearly indicated that feed intake in those pigs was higher than in the others, permitted to graze during 8 h every day. Calculated daily gain was 820 and 757 g in YL pigs when reared in total confinement or partially outdoors, whereas this same trait was 414 and 335 g in PM pigs. When a comparison was made between improved and local pigs reared in total confinement, feed conversion was on average, 3.07 kg kg-1 in the YL animals and 5.03 kg kg-1 in the PM pigs.
 
 
 
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