Potential of natural pasture in Shebedino district, Southern Ethiopia was assessed. Based on availability and practice of supplementation of sweet potato vine (SPV) for livestock, 6 representative kebeles were selected from among 3 towns, 4 Degas, 15 sweet-potato-producing (SPP) and 13 sweet-potato-non-producing (SPNP) Kebeles. From each Kebele 30 households (HHs) were randomly selected and interviewed. Grazing land was protected (June-December/2013) and forage samples taken using a 0.5 m × 0.5 m quadrate from three strata. District average land holding was 0.43±0.45 ha/HH, SPP having larger land holding than that of town kebeles. In towns with no grazing land, 40% of HHs feed byproducts to livestock. In SPP and SPNP Dega Kebeles, private grazing land provided 37 to 43% of feed. All farmers feed SPV to livestock and most during dry seasons, although only 20% of the HHs cultivate sweet potato. Feed shortage was 35% of constraints to livestock production followed by low productivity of livestock (19%). At times of critical feed shortage, 50% of town-HHs sell their livestock, the rest prefer searching for supplements as mitigation strategy. Dry matter (DM) and organic matter (OM) yields ((3663±63 and 3187±50 kg/ha, respectively) of the 4th cut was the highest (p<0.05). Upper strata produced the highest (p<0.05) DM (4145±132 kg/ha) and OM (3604±112 kg/ha) yields. Similarly, DM (4145 ±132 kg/ha) and OM (3604±112 kg/ha) yields of upper strata at 4th cut were highest (p<0.05) of all cutting stages and strata combinations. The DM and CP contents of green grass of first cut were 33.77±3.83 and 15.17±0.00 and at the 4th cut 91.57±11.79 and 10.76±0.00%, respectively. In-vitro DM Digestibility of grasses of first cut was 68.11±0.00 and of 4th cut 57.8±0.04%. As family size increased, grazing land and the corresponding feed get reduced, hence decreased livestock productivity. With stage of maturity of the natural pasture, DM and OM yield increased but CP and DM digestibility decreased. Therefore conserving natural pasture as hay need be encouraged.
Key words: Digestibility, natural pasture, sweet potato producing, sweet potato non-producing.
MATERIALS AND METHODS
RESULTS AND DISCUSSION
The average family size of the District was 7.07±2.43 which was larger in sweet potato-producing Kebeles and lowest in Town Kebeles; non sweet-potato producing while Dega Kebeles are found in between. The current family size is higher than earlier reports (Nigatu, 2011; FPENUNS, 2010).
Overall average land holding size was 0.43±0.45 ha per household (HH), largest land holding was found in sweet-potato-producing (SPP) followed by non-sweet potato producing (NSPP), Dega and Town Kebeles in decreasing order (Table 1). The average land holding size of the district was much lower than that of rural HHs of Adami Tullu Jiddo Kombolca district (2.66±2.1), Badiwach (1.29ha) and Soddo Zuria (0.58-0.96 ha), Walayita Zone (Duressa, 2007; Netsanet, 2006; Adugna, 1990). Grazing land in NSPP Kebeles was much lower than those of some rural areas of Southern Ethiopia such as Sinana and Dinsho districts in Bale Zone (Solomon, 2004) and Adami Tullu Jiddo Kombolcha district (Duressa, 2007), Badiwach (0.15ha±0.005) and Soddo Zuria (0.14±0.006) of Walayita Zone (Netsanet, 2006).
The survey indicated that cattle, sheep, goat, equine (donkey) and poultry (indigenous, Rhode Island Red and White Leghorn) are dominant livestock species. There were more cattle per HH than other species. In Dega Kebeles HHs owned more cattle which disagrees with earlier reports for neighboring places such as Adami Tullu Jiddo Kombolcha District (Duressa, 2007), Southern Ethiopia in pastoral and semi pastoral areas (Adugna and Aster, 2007) and Badewacho and Soddo Zuria, Walayita Zone (Netsanet, 2006). The lowest number of cattle per HH was observed in towns. Mean cattle holding size within all Kebeles was much lower than that reported (10.96TLU) for Adami Tullu Jiddo Kombolcha District (Duressa, 2007), (8.65TLU) for Sinana and (11.52TLU) for Dinsha (Solomon, 2004) and (10.96TLU) for Badewacho and Soddo Zuria districts (Netsanet, 2006). The smaller TLU per HH in Shebedino district could be attributed to shrinkage of grazing land. Mean sheep holding size followed cattle trend but was nil in Town. Number of equines per HH was the lowest of all and it was absent in Town and Dega. Dega Kebeles were rearing more cows, heifers, calves and sheep.
The available feed resources and methods of feeding are presented in Table 2. In town and its periphery, there was no private grazing land at all thus, about 40% of HHs use byproducts followed by communal grazing land (open areas). Private grazing land contributed to more than 1/3 of feed sources in Dega, sweet-potato-producing and non-sweet potato producing Kebeles followed by communal grazing land, private and purchased crop residues.
At national level, green fodder contributes more than half, whereas crop residues nearly 1/3 and the rest come from hay and industrial byproducts. In SNNPRS, green fodder contributes 75% of total feed sources which is much higher than the national figure. Crop residue production is nearly equal to the national figure while hay and byproducts contribute only 2% of the total feed resources which is slightly less than the national figure (CSA, 2009).
The overall contribution of green fodder to livestock feeding from private and communal grazing land was 57% in Shebedino district which was lower than regional but comparable with that of national figures. Netsanet (2006) reported that the natural pasture in the wet season at Badewacho contributed 79% while in Soddo Zuria it was 70% which were still much higher than that of Shebedino district. The difference could be attributed to the variation in land use system where more land is assigned to crop production especially to perennial crops such as coffee than grazing land. Getnet and Ledin (2000) reported that livestock are mainly dependent on crop residues and natural pasture as sources of feed which agrees with the result of this study. Practice of feeding hay in the District was lower than the national but comparable with that of regional experience. More HHs were feeding byproducts to livestock in the district than at national and regional levels. It can thus be concluded that hay making is a less common practice in the region and district.
Only very few of the respondents of the sweet-potato-producing Kebeles produce sweet potato but none from the other Kebeles. Adugna and Said (1992) reported that in Badewacho and Soddo Zuria, sweet potato vine as well as enset and cassava leaves were used during dry seasons as feed resource but in our study only few farmers used it perhaps due to lack of adaptation by farmers. All the farmers, who plant sweet potato, have used the sweet potato vine as feed supplement. Utilization of sweet potato vine as feed supplement and the method of utilization vary significantly (p<0.05) during different seasons of the year. Nearly 2/3 of respondents feed sweet potato throughout the year, less than 1/3 during the dry season and few used it only during wet season. Adugna and Said (1992) reported that in Walayita, most of the farmers utilize sweet potato vine, enset and cassava during the dry season which differs from the result of this survey perhaps due to differences in adaptation of use of sweet potato vine which resulted from week extension service.
Livestock feeding methods, their constraints and mitigation strategies
Nearly 60% of the respondents used free grazing followed by stall feeding but the two systems were not practiced together by farmers and thus was given the lowest rank (Table 3).
Feed shortage was most important constraint in Towns, followed by Dega, SPP and NSPP Kebeles which agree with the results of studies of Tsedeke (2007) and Yenesew (2009) where DM supply to livestock in moist highland crop-livestock, sub-moist highland crop-livestock and sub-moist low land crop-livestock systems was in the negative balance.
In towns, selling livestock is the most commonly used option to overcome the feed shortage (Table 4). Irvin (2000) put that farmers combat feed shortages by feeding livestock with feeds normally intended for human beings such as sweet potato tubers, maize and enset, which is normally reserved for animals at risk. In similar way, Adugna et al. (2000) asserted that at national level, the traditionally grown sweet potato tuber is used for human consumption and the byproduct (vine) used as feed supplement. Reports of both studies are compatible with the results of this study. On the other hand, supplementation of feed from any source is the primary options in sweet-potato-producing and non-sweet-potato-producing Kebeles of Dega.
As shown in Table 5, DM and OM yield of the first three cuttings were similar (p>0.05) but they were lower than that of the fourth cutting (p<0.05).
There was a significant difference in production of DM and OM among strata (Table 5). The upper stratum produced greater overall DM and OM yields than the middle and lower strata. The difference could be attributed to fast drainage in upper stratum and accumulation of flood debris resulting in water logging in the middle and lower stratum. The forages DM and OM yields at any strata at the fourth cut were more than at cuts 1, 2 and 3 (p<0.05).
Nutrient contents and in vitro dry matter digestibility of the natural pasture of the grazing land at two cutting stages are depicted in Table 6. The DM yield of mixture of forage of the first three cuttings was more or less similar with the results of the study on mixture of guinea grass with Stylosanthus guianensis (stylo) at a ratio of 2:2 and 3:1 harvested 150 days after sowing that gave the same relative yield; but any mixture of guinea grass with S. guianensis (stylo), C. pubescens (centro), burgundy bean and A. pintoi at any ratio was greater than the DM yield in this study. The DM yield of mixture of forages from the first three cuttings in this study agreed with that of Bua et al. (2001) and Tikuneh (2009) but it was greater than that reported by Tegene et al. (2010) for Umbulowacho watershed. This could be attributed to variability in rain fall, cutting time, soil type and topography. The reports of MoA for 1984 agreed with the different highland zones of Low Potential Cereal Livestock Zone (LPC/LZ) and seasonal water logged soil while the study of Sisay (2006) nearly agreed with the DM yield of the 4th cuts.
The mean CP content of this study for 1-3 cuts’ mixture period match with that of the open area but the CP content of this study of 4th cut was lower than that of closed, medium and low altitudes (Tegene et al., 2010). According to same authors, CP content of the green forage was comparable with open area that received animal dung and urine and low altitude that received valuable nutrient brought from the upper areas via flood and erosion; while the low CP content at 4th cut of this study was caused by over maturation and that may be comparable with that of closed area that was devoid of animal dung and urine and that of the medium and high altitudes caused by removal of nutrient by soil erosion. In this study, as maturation increased, CP content slightly decreased which agrees with the report of Tegene et al. (2010).
The NDF and ADF contents of the forage between the first three cuttings and 4th cutting were nearly similar which disagree with Tikuneh’s (2009) report but were similar to that of Tegene et al. (2010). As the stage of maturity of the forages in the natural pasture increased the ADL content increased but in the study of Tegene et al. (2010), as the closure period increased, there was no change in the ADL content for the probable reason that there is re-growth with less lignified forages. In this study, high DM and ADL and low CP contents decreased IVDMD which agrees with the results of earlier studies (Tikuneh, 2009; Tegene et al., 2010).
CONFLICT OF INTEREST
The authors do not declare any conflict of interest
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