02363naa a2200253 a 450000100080000000500110000800800410001910000170006024501270007726000090020452016230021365000110183665000120184765000210185965000250188065000270190565300270193265300310195965300210199070000170201170000170202870000150204577300490206015310602005-04-05       2001    bl uuuu     u00u1 u    #d1 aBAKER, R. L.  aGenetic resistance to gastro-intestinal nematode parasites in Galla and Small East African goats in the sub-humid tropics.  c2001  aA study was carried out from 1992 to 1996 to compare lhe resistance to naturally acquired gastro-intestinal (Gl) nematode parasite infections (predominantly Haemonchus contortus) of GalIa and SmalI East African goats in lhe sub-humid coastal region of Kenya. A total of 204 GalIa and 349 SmalI East African (SEA) kids were born from five kiddings. These were lhe progeny of 18 GalIa and 17 SEA bucks. Live weights (LWT), blood packed-celI volume (PCV) and faecal egg count (FEC) were recorded at 1- to 2-month intervals from birth to about 14 months of age. The SEA kids were more resistant to GI nematode parasites than GalIa kids as shown by their significantly lower FEC (P &lt 0.001) in lhe post-weaning period (8- to 14-month-old kids) and lower mortality from birth to 14 months : of age (P &lt 0.05). There was no significant (P &gt 0.05) breed effect on PCV; but GalIa kids were significantly heavier (P &lt 0.001) at alI measurement times between birth and 14 months of age. Heritability estimates for LWT, pcv and FEC at lhe different sampling times were characterized by high standard errors. Heritability estimates for records taken at 4.5 and 8 months of age from a repeated measures analysis were 0.18 (s.e. 0.08) for pcv and 0.13 (s.e.0.07) for logarithm-transformed FEC. The phenotypic and genetic correlation estimates between pcv and LFEC were moderately to highly nega tive and averaged -0.36 and -0.53, respectively. The results are discussed in relation to the limited evidence for resistance to GI nematode infections in goats and compared with lhe much stronger evidence for resistance in sheep.  aAfrica  aCaprino  aGenética Animal  aHaemonchus Contortus  aResistência Genética  aMelhoramento genético  aNematóide gastrintestinal  aRegião tropical1 aAUDHO, J. O.1 aADUDA, E. O.1 aTHORPE, W.  tAnimal Sciencegv. 73, pt 1, p. 61-70, 2001.