The data were evaluated for normality and analysed using the Statistical Analysis System – SAS 9.1 (SASInstitute 2005). The results are expressed as least squares (LS) means standard error of the mean (SEM) or percentages,
according to the variable type. Variables such as oestrous duration and IOEO were analysed using the MIXED procedure with comparison of means by the Tukey–Kramer test. The trio was included in the model as a random variable. Follicle size was analysed
for each evaluation time through theMIXED procedure with comparison of means by the Tukey–Kramer test, including the follicle size at oestrous onset as a covariate
in the model. The frequency distribution of IOEO (cumulative and at each time point of evaluation), pregnancy rate and adjusted farrowing rate (AFR) were
analysed through logistic regression using the GLIMMIX procedure. For AFR calculation, dead gilts and those culled for non-reproductive reasons were
excluded. The effects of treatment, number of oestrous cycles (2 and 3), age of semen (≤24 and >24 h) and boars were included as class variables in these models. Total born piglets was analysed using the MIXED procedure,with inclusion of the fixed effects of treatment, number of oestrous cycles, boars and age of semen, whereas the trio of gilts was included as a random effect.
The data were evaluated for normality and analysed using the Statistical Analysis System – SAS 9.1 (SASInstitute 2005). The results are expressed as least squares (LS) means standard error of the mean (SEM) or percentages, according to the variable type. Variables such as oestrous duration and IOEO were analysed using the MIXED procedure with comparison of means by the Tukey–Kramer test. The trio was included in the model as a random variable. Follicle size was analysedfor each evaluation time through theMIXED procedure with comparison of means by the Tukey–Kramer test, including the follicle size at oestrous onset as a covariatein the model. The frequency distribution of IOEO (cumulative and at each time point of evaluation), pregnancy rate and adjusted farrowing rate (AFR) wereanalysed through logistic regression using the GLIMMIX procedure. For AFR calculation, dead gilts and those culled for non-reproductive reasons wereexcluded. The effects of treatment, number of oestrous cycles (2 and 3), age of semen (≤24 and >24 h) and boars were included as class variables in these models. Total born piglets was analysed using the MIXED procedure,with inclusion of the fixed effects of treatment, number of oestrous cycles, boars and age of semen, whereas the trio of gilts was included as a random effect.
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