Abstract:
Indigenous breeds adapt and survive in often challenging environments and diverse agroecological areas representing an important genetic resource for livelihood of their owners and the national economy at large. Therefore, there is a need to improve the productivity of indigenous animals through developing sustainable breeding programs so as to enhance their competitive advantage in the face of crossbreeding threats. The current study was performed in Kafta Humera district of Tigray National Regional State of Ethiopia with the general objective of developing sustainable breeding program for improving performance of Begait goat to assure the livelihoods of the breed owners and to survival of Begait goat as a breed. Specific objectives of the current study were to: (i) describe production systems and breeding practices for Begait goat breed (ii) evaluate some reproductive and productive performance parameters of the breed under village (on-farm) and research (on-station) management (iii) identify breeding objective of the breed owners using own-flock ranking experiment and developing bio-economic models and (iv) design and evaluate alternative breeding schemes for genetic improvement of the breed. This dissertation contained five papers/manuscripts. The results of Paper I were based on survey of 150 (100 small-scale and 50 large-scale) sample household heads, in-depth focus group discussions and personal observations. The results revealed that agricultural production system in the area was mixed crop-livestock production system. Two types of goat farming systems were identified specifically small-scale and large-scale farming systems. Goat flock sizes were 23.21±13.42 and 68.43±15.38 under small-scale and large-scale farming systems, respectively. The results indicated that farmers under the two farming systems keep goats to generate cash income, milk and meat for home consumption with different index value. Natural pasture, browse species, crop residues and crop aftermath were the accessible feed resources. Rivers, ponds and borehole were available water sources for domestic use and for watering animals in the study area. Mating under the two farming systems was uncontrolled because of communal grazing and watering points. Small-scale and large-scale farmers use body size, twinning ability and milk yield for does whereas body size, growth rate and libido for bucks as selection criteria both with different index values. Water shortage, feed and grazing land shortage, insufficient veterinary service and lack of market demand were the most significant goat production constraints in the area. Papers II and III were based on monitoring data collected under two management systems (on-farm and on-station) during the period between October 2014 and December 2016. The results showed that the overall least squares means and standard error (±SE) of body weight at birth (BW), three month (3MW), six month (6MW), nine month (9MW) and twelve month (12MW) were found as 2.69±0.03, 10.71±0.44, 15.60±0.53, 18.30±0.43 and 22.36±0.52 kg, xiii respectively. The overall mean pre-weaning daily weight gain (ADG-I) was 89.10±1.54 g/day, whereas post-weaning daily weight gain (ADG-II) was 54.24±1.75 g/day. The overall mean values of age at puberty, age at first kidding (AFK) and kidding interval (KI) were 214.58±1.20, 429.24±6.46 and 238.75±2.04 days, respectively. Litter size (LS) in the current study ranged from 1 to 3 with the mean of 1.52±0.02 kids per doe per kidding (Paper II). The overall mean daily milk yield (DMY), lactation milk yield (LMY) and lactation length (LL) included: 0.61±0.01 kg, 64.3±1.23 kg and 104±1.22 days, respectively (Paper III). Nongenetic factors estimated (management system, kid sex, parity number, birth type and birth season) highly significantly (p