American Journal of Agricultural Science 2015; 2(3): 75-79 Published online April 20, 2015 (http://www.aascit.org/journal/ajas)
Genetic and Environmental Factors Affecting Reproduction of Saanen Goats Raised Under Sudan Conditions Safaa A. Abdalla, Ibrahim A. Ishag*, Mohamed-Khair A. Ahmed Department of Genetics and Animal Breeding, Faculty of Animal Production, University of Khartoum, Khartoum North, Khartoum, Sudan
Email address
[email protected] (I. A. Ishag)
Keywords Birth Weight, Kidding Interval, Number of Service, Saanen, Goat
Received: March 25, 2015 Revised: April 8, 2015 Accepted: April 9, 2015
Citation Safaa A. Abdalla, Ibrahim A. Ishag, Mohamed-Khair A. Ahmed. Genetic and Environmental Factors Affecting Reproduction of Saanen Goats Raised Under Sudan Conditions. American Journal of Agricultural Science. Vol. 2, No. 3, 2015, pp. 75-79.
Abstract This study was carried out to evaluate the reproductive characteristics of Saanen goats raised in the semi arid region of Khartoum State. The averages of birth weight, age at first kidding, number of services to conception and kidding interval were 3.25±0.06 kg, 458.11±11.89 day, 1.53±0.12 times and 315.29±14.26 days, respectively. The origin of birth (Netherlands or Sudan) and parity had insignificant (P>0.05) influence on the studied traits; but the parity number had significant (P0.05) affected by season of kidding and origin of birth
ofdam. The birth weight increased significantly with rising parity order, the lowest weight was recorded in the first parity and the heaviest weight was recorded in the7th parity. The birth weight was highest in the first two years and then decreased. Single birth was significantly heavier, followed by twins, while triplets were significantly lower in birth weight. Male kids were significantly heavier at birth compared to females.
American Journal of Agricultural Science 2015; 2(3): 75-79
Table 2. Factors affecting birth weight of Saanen goats raised under Sudan conditions. Item Origin: Imported Locally born Parity: 1st 2nd 3rd 4th 5th 6th 7th Season of kidding: Dry summer Wet summer Winter Year of kidding: 2004 2005 2006 2007 2008 2009 2010 2011 Birth type: Single Twins Triplet Sex of offspring: Male Female Overall mean CV
N 378 293 222 149 111 86 50 31 22 204 80 387 8 50 133 105 116 150 83 26 201 362 108 317 354 671
LS Mean ±SE NS 3.25a±0.05 3.25a±0.08 *** 2.94d±0.06 3.13c±0.07 3.20bc±0.08 3.33b±0.09 3.24bc±0.11 3.24bc±13 3.67a±0.15 NS 3.25a±0.07 3.16a±0.10 3.35a±0.05 *** 3.69a±0.23 3.49ab±0.12 3.07b±0.09 3.23b±0.08 3.30b±0.07 3.00b±0.06 3.14b±0.08 3.10b±0.13 *** 3.68a±0.07 3.20b±0.06 2.88c±0.8 * 3.31a±0.06 3.20b±0.06 3.25±0.06 19.3
3.3. Age at First Kidding Table 3. Factors affecting age at first kidding of Saanen goats raised under Sudan conditions. Item Origin Imported Locally born Season of kidding: Dry summer Wet summer Winter Year of birth: 2003 2004 2005 2006 2007 2008 2009 Overall mean CV
N 96 96 102 21 69 6 18 82 32 16 26 12 192
LS Mean ±SE (day) NS 435.85a±23.00 480.37a±18.30 NS 476.37a±13.18 453.61a±24.50 444.35a±14.30 *** 454.17b±45.06 392.93bc±28.27 426.73bc±18.60 369.14c±24.51 410.65bc±30.23 577.41a±26.51 575.75a±34.02 458.11±11.89 22.29
Table 3 presents least squares means of factors affecting age at first kidding. The overall mean of age at first kidding was 458.11±11.89 day. Analysis of variance results revealed that the year of birth significantly (P0.05) influence on the trait. The trait
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was found to be significantly shorter in the early years, and increased in later years reaching its highest value in the last two years. 3.4. Number of Services per Conception (NSC) Table 4 shows the least squares means of factors affecting NSC of Saanen goats. The overall mean of number of services per conception was 1.53±0.12.The season and year of calving had significant influence on NSC, while origin and parity number had no significant (P>0.05) effect on NSC. Does inseminated in dry summer season needed significantly (P
