Effect of the size and sex of the pigs at the beginning of the finishing phase on productive indicators at the end of fattening
Abstract
The effect of segregation by sex and size at the start of the growing-finishing stage on traits at the end of the fattening and at slaughter was studied in commercial pigs, 121 Danbreed×Pietrain pigs were used, entire males and females. They were divided in good and bad males, and good and bad female groups (G). They were housed in 9 m2 pens. The pigs received clean, fresh water, and ad libitum food and water. The initial weight varied from 12.4±2.0 to 25.3±2.3 kg. The target weight was 115 kg. Fattening was divided into growth (0-60 d) and finishing phases (60-120 d). The response variables were initial (P1), intermediate (P2), and final weight (P3); total feed intake (CMD); daily weight gain between P1 and P2 (GDP1y2), P2 and P3 (GDP2y3), and P1 and P3 (GDP1y3); and feed conversion ratio (CA). The pigs that reached the target weight in 114 d were termed "first quality", the "second quality" in 122 d, the "underachievers" did not reach this weight in 122 d. The GLM procedure of SAS and statistical analysis with learning machines in R were used to analyze the of productive variables and to determine the factors affecting the quality of the pigs at the end of fattening. The females exceeded (P≤0.0263) the males by 2.72 kg and 0.05 kg d-1 for P2 and GDP1y2. The sex*G interaction affected (P≤0.0181) P3, GDP1y3, and GDP2y3. Sex of pig and G were not the most important factors to classify quality at the end of fattening. Regrouping pigs by sex and size at the beginning of the growth-finishing phase affected significantly the productive performance and indirectly influences quality at the end of fattening.
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