Browsing by Author "Molotsi, A. H."
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- ItemFactors influencing off-take rates of smallholder sheep farming systems in the Western Cape Provinve of South Africa(South African Society of Agricultural Extension, 2019) Molotsi, A. H.; Oosting, S.; Cloete, S. W. P.; Dzama, K.The purpose of this study was to determine off-take rates in smallholder sheep farming systems in the Western Cape province of South Africa. A purposeful sampling technique was used where smallholder farmers were selected based on certain criteria. The criterion set out was that farmers must own between five and 100 sheep. Interviews were conducted with 72 smallholder farmers in three districts, namely the West Coast, Karoo and Eden. General information on the socio-economic status of the farmers was obtained through semi-structured questionnaires. The main sources of income for the Karoo farmers was livestock (46%) and crops for Eden (32%). Farmers in the West Coast area mostly relied on salaries (43%), thus off-farm income. The Karoo district sold a higher average number of lambs per year (41 ± 8.8), with West Coast and Eden selling the same average number of lambs per year at 7 ± 2.2 and 7 ± 2.6 respectively. Overall, the income derived from livestock is low and not economically sustainable. Therefore, different strategies (such as access to market, financial assistance, improved animal nutrition and health management, as well as sound breeding plans) should be employed to assist smallholder livestock farmers to increase off-take rates.
- ItemPreliminary genome-wide association study for wet-dry phenotype in smallholder ovine populations in South Africa(South African Society for Animal Science, 2017-04-10) Molotsi, A. H.; Taylor, J. F.; Cloete, S. W. P. (Schalk Willem Petrus van der Merwe); Muchadeyi, F.; Decker, J. E.; Sandenbergh, L.; Dzama, K.The aim of this study was to identify single nucleotide polymorphisms (SNPs) associated with genomic region underlying variation in the binomial reproductive trait ‘wet-dry’ in sheep. The wet-dry phenotype was used to represent the reproductive status of the ewes, divided into two categories, dry (ewes that did not lamb or that lost a lamb) and wet (ewes that had lambed and had at least one suckling lamb). Wet-dry records were obtained from smallholder farmers (n = 176) and Nortier Research Farm (n = 131) for the 2014 breeding season. Ages of the ewes ranged from 1 year to 6+ years. Data from 307 individuals were analysed, of which 172 Dorpers and 4 White Dorpers were from smallholder sheep flocks and 48 Dorpers, 46 Namaqua Afrikaners, 26 South African Mutton Merinos, 4 South African Mutton Merino x Dorper and 7 Dorper x South African Mutton Merino crossbreds were from the research farm. A logistic regression model was fitted to adjust the data for the fixed effects of farm, breed, and age of the ewe and weight at mating as a covariate. Linkage disequilibrium (LD) and inbreeding coefficient were estimated using PLINK. Association analysis was performed using the genome-wide efficient mixed-model association package (GEMMA) to determine whether any significant SNPs were associated with the wet-dry reproductive trait. The wet-dry phenotype differed significantly between the smallholder (0.63 ± 0.04) and research farm flocks (0.79 ± 0.04). Genome-wide LD across all populations was r2 = 0.36. Dorpers from the smallholder flock exhibited rapid LD decay versus the resource ovine populations. Inbreeding levels were also lower for the smallholder flock (4 ± 0.003%) versus the research flock (13 ± 0.008%). No significant SNPs were identified after correction for false discovery rate. The heritability estimate for wet-dry using SNP information was 0.24. This estimate concurs with the literature and indicates the possibility of using genomic selection to improve reproduction in smallholder sheep flocks.