Data extracted from the analysis of herd records were entered in Excel. The descriptive statistical analysis of the age at first calving (calculation of frequencies, means, standard deviations, minimum and maximum) was made with the XLSTAT software (6.1.9 release). These parameters were analyzed by ANOVA and the results were compared using the Newman-Keuls test. Differences were considered significant for p < 0.05.
The indicate ages to start with calving for everybody types build try ± days, representing just as much as 36 months (2 years eleven weeks 19 months ± 11 weeks a day). The minimum was months plus the limit is weeks. The most precocious heifers calved in this couple of years ( months). Getting fifty% of heifers, very first calving is at months. The first attributes happened typically from the ± weeks ( to weeks).
The fresh indicate AFC of one’s crossbreeds are less than men and women reported one of several Zebu in tropics on over forty months advertised in several studies ( Rahman et al., 2016 ; Tellah ainsi que al., 2015a , 2015b ; Bashir and you will El Zubeir, 2013 ; Sokouri ainsi que al., 2010 ; Bayemi et al., 2005 ). , 2015 ). Certain writers have stated overall performance extremely alongside all of our observation on various other crossbreeds inside the Africa, in spite of cow breeds included in the latest experiment: 34 weeks one of many Montbeliard crossbreeds inside Algeria ( Madani and you will Mouffok, 2008 ) and you may Morocco ( Srairi and you can Mousili, 2014 ), ± 0.43 days in the Girolando hybrid within the Benin ( Doko mais aussi al., 2012 ). It had been a comparable to the Holstein-Friesian hybrid cows in the Ethiopia within thirty six.cuatro ± 1.7 weeks, the brand new Borgou and you can Lagunaire types in the thirty six.step 1 ± six.30 days for the Benin ( Adamou-Ndiaye et al., 2003 ) and in the fresh Azawak Zebu during the 36.5 ± cuatro.10 and you may ± 13 months for the Niger ( Achard and you may Chanono, 2006 , 1997 ).