<span style="font-family:Verdana;">The experiment was conducted to evaluate the effect of groundnut haulm and maize bran mixture supplementations on feed intake, digestibility, body weight gain and car...<span style="font-family:Verdana;">The experiment was conducted to evaluate the effect of groundnut haulm and maize bran mixture supplementations on feed intake, digestibility, body weight gain and carcass characteristics of local sheep fed hay basal diet at Salga sheep farm in Assosa district, Western Ethiopia. The experiment was laid out in a randomized complete block design (RCBD) with four treatments consisting of six blocks with four animals per block based on their initial body weight of 20.12 ± 0.05 kg (mean ± SD). Treatments comprised of feeding natural pasture hay ad libitum T1 = 0;T2 = 100% maize bran (MB);T3 = 50% MB and 50% Groundnut haulm (GNH), and T4 = 100% GNH. The amount of supplements offered was 300 g/day/animal on DM basis. The daily feed intake, daily body weight gain, feed conversion efficiency, dry matter and nutrient digestibility, and carcass characteristics parameters were measured during the experimental period. The study result indicates that the crude protein (CP) contents were 7.12% and 11.6%, and the neutral detergent fiber (NDF) contents were 67.9% and 57.5% for natural grass hay and groundnut haulm, respectively. The total DM intake was higher (P < 0.001) in T4 (941 g/day) followed by T3 (937 g/day), and T2 (934 g/day). However, the control group (T1) consumed relatively higher basal dry matter (DM) (767 g/day) as compared to all other groups. Local Sheep supplemented with T4 had significantly different (P < 0.001) FBW (33.2 vs 24.3 kg), FCE (0.17 vs 0.08) and ADG (156.2 vs 46.4 g/day) as compared to the control group. The mean DM, OM, and ADF digestibility in the control group (T1) was significantly lower than the supplemented groups (P < 0.001), but there is no significant difference between supplemented treatments (T2, T3, T4). The CP digestibility was the least in the control group (T1) than the supplemented (76 vs 85.5, 88.8 and 89.3 for T1, T2, T3 and T4, respectively). Furthermore, dressing percentage on slaughter weight and empty body weight basis and rib-eye muscle area were high for T4. Empty body weight and hot carcass weight were higher in T4 (27.5 and 15.2 kg) and T3 (25.5 and 14.1 kg) as compared to the control group (19.8 and 10.3 kg), respectively. Similar to biological performance, the economic analysis also showed that supplementation with T4 resulted in better returns compared to others. Thus, it can be concluded that supplementation in general improved animal performance. Among the supplements, T4 is biologically optimum and economically feasible.</span>展开更多
This study aimed to evaluate the performance and potential of development local sheep in sub-district Kaliangkrik. Respondents were taken from sheep farmers in the village Munggangsari and Wonocoyo with the number of ...This study aimed to evaluate the performance and potential of development local sheep in sub-district Kaliangkrik. Respondents were taken from sheep farmers in the village Munggangsari and Wonocoyo with the number of livestock ownership of at least two tails. This study used a survey method, with sampling of respondents in the census. The results showed the average number of sheep ownership as much as 0.47 animal units （AU） with a range of 0.14 AU to 1.15 AU. The largest population structure is lamb （25.66%）, ewe （23.03%）, ram （18.61%）, ram lamb （16.92%） and ewe lamb （15.79%）. Sex ratio of ram： ewe is 1：1.5 for adult sheep and 1：1.2 for lambs. Weight of ram is 26.75 kg and ewes 26.37 kg; weight of male lamb is 8.42 kg, with average daily gain （ADG） 48.11 g/head/day, while the female lamb 6.61 kg with ADG 44.13 g/head/day. The average sheep lambing interval was 8.4 months, with an average litter size of 1.3 tails. Based on the calculation of the adequacy of feed, the obtained level of sufficiency （feed production ratio and feed requirement） is 1.89, which means the area has adequate feed production. It was concluded that sheep productivity was good enough and potentially to be developed in Kaliangkrik region.展开更多
In recent decades, a considerable number of local breeds have been replaced by high-yielding breeds for reasons of profitability. Many local breeds are now threatened by extinction and the loss of their native genetic...In recent decades, a considerable number of local breeds have been replaced by high-yielding breeds for reasons of profitability. Many local breeds are now threatened by extinction and the loss of their native genetic diversity. The need to conserve breeds and their genetic diversity has a major importance due to the necessity for genetic change within and between populations. Novel approaches have to be explored and extended to maintain this genetic diversity. The aim of this study was the identification and implementation of breed-specific traits for a small, local sheep breed in northern Germany. The data comprised pedigree information, estimated breeding values (EBVs) of several conventional traits, and phenotypic information from a field experiment for two novel traits: 1) average daily gain under extensive circumstances (ADGE) and 2) ultrasonic measurements of muscle-fat ratio (UMFR). The experimental design included a dataset of 47 progeny from 14 pure-bred rams of German White-Headed Mutton (GWM). The methodical approach was divided into four parts: 1) the analysis of the breeding programme, 2) the identification of breed-specific traits, 3) the estimation and correlation of novel breeding values, and 4) the consequences of implementing these novel traits. Genetic parameters and correlations were conducted by applying linear mixed models. The estimates for the heritability (repeatability) were between 0.70 and 0.83 (0.42 and 0.46). The genetic correlation was positive (0.61) and in accordance with the phenotypic correlation (0.62). Average daily gain under intensive circumstances (ADGI) was moderately positive correlated with muscularity (0.60), as opposed to ADGE, which was moderately negative correlated with muscularity (-0.68). The EBV of ADGE was also moderately positive correlated with UMFR (0.64). Genetic response for ADGE enhanced to values of 481.09 g/day, 639.97 g/day, >700 g/day and >850 g/day for different selection intensity scenarios. Corresponding rates of inbreeding were 1.4%, 2.7%, 5.1%, and 7.9% after 10 years of selection. Genetic response for UMFR increased to 0.92, 1.34, 2.41, and >2.75, whereas remaining rates of inbreeding increased to 1.1%, 2.2%, 5.1%, and 7.9%. ADGI and ADGE were tendentially negatively correlated (-0.11), which strengthen the assumption of a biased ADGI. ADGE has a positive influence on meat-quality aspects (UMFR). Optimal use of reference sires with predefined selection intensity achieves genetic response for ADGE and UMFR with simultaneously acceptable rates of inbreeding.展开更多
The reproductive and lamb mortality data (n = 187) of the Local and crosses of Dorper × Local ewes following natural controlled breeding in Ethiopia were analysed. Data were collected during 2009-2011 at Sirinka ...The reproductive and lamb mortality data (n = 187) of the Local and crosses of Dorper × Local ewes following natural controlled breeding in Ethiopia were analysed. Data were collected during 2009-2011 at Sirinka breeding, evaluation and distribution site, eastern Amhara region of Ethiopia. Breed, lamb sex, birth season, birth year, birth type and ewes’ parity were considered as fixed effects. Data analyses were performed using general linear model procedures. Breed was a significant source of variation: the local sheep attained faster the age at first lambing than the crossbred ewe lambs (469 ± 8.45 vs. 555 ± 6.25 days, p < 0.0001), whereas the crossbred ewes weighed more than the local sheep ewes at the age of first lambing (32.7 ± 0.63 vs. 22.8 ± 0.43 kg, p < 0.0001). Birth year had also important influence on the age and weight at first lambing of ewes. Ewes showed better performance during the later study years, differences attributed due to the improved management advantages in later years. The crossbred and local ewes were comparable in their litter size, despite the fact that the lambing interval of crossbred ewes was longer than the local ewes (306 ± 4.62 vs. 287 ± 2.38 days). Additionally, there was no significant difference in mortality rate between the two breeds. This study confirms that the local ewes had higher annual reproductive rate than that of the crossbred sheep ewes (1.49 ± 0.02 vs. 1.37 ± 0.01 lambs) under the same environmental conditions. The present results suggested that better management and breeding program probably will increase the productivity of the local sheep.展开更多
旨在挖掘绵羊中与优异性状相关基因,对遗传改良与育种实践具有重要价值。本研究以93只策勒黑羊、33只皮山红羊和13只瓦格吉尔羊为对象,进行颈静脉采血、DNA提取、基因分型。用PLINK软件对基因型数据进行质量控制(质控标准为:剔除个体检...旨在挖掘绵羊中与优异性状相关基因,对遗传改良与育种实践具有重要价值。本研究以93只策勒黑羊、33只皮山红羊和13只瓦格吉尔羊为对象,进行颈静脉采血、DNA提取、基因分型。用PLINK软件对基因型数据进行质量控制(质控标准为:剔除个体检出率小于90%、SNP检出率小于95%、最小等位基因频率小于5%、哈代温伯格平衡P<1×10-6的SNPs)和主成分分析(PCA),构建进化树、群体祖先成分分析和连锁不平衡分析(LD),同时基于全基因组长纯合片段(runs of homozygosity,ROH)分析和群体遗传分化指数(F_(ST))分析,选择前10%的ROH片段作为高频区域和F_(ST)值的前5%位点作为受选择区域,参考绵羊基因组Oar_v4.0注释基因并进行GO和KEGG分析。F_(ST)和FROH结果表明,3个群体之间遗传分化水平较低,且在K=4呈现清晰的遗传背景分化。同时识别出ACVR1、ACVR1C、UPP2、CRY1和NR4A2等是南疆地方绵羊品种在干旱沙漠环境中形成遗传适应性的候选基因。本研究通过群体遗传结构多样性和选择信号分析,揭示了南疆地方绵羊品种的遗传变异特征,从多维度的遗传变异视角寻找到相关优异基因,为绵羊种质资源保护、新品种培育及资源多样性提升提供了重要参考依据。展开更多
针对奶绵羊三维重构中背景分割对复杂场景适应性不足、配准算法对初始位置敏感等问题,该研究提出一种融合改进PointNet++与一致性点漂移(coherent point drift,CPD)算法与局部区域重叠的三维重构方法。通过引入点对特征、优化采样策略...针对奶绵羊三维重构中背景分割对复杂场景适应性不足、配准算法对初始位置敏感等问题,该研究提出一种融合改进PointNet++与一致性点漂移(coherent point drift,CPD)算法与局部区域重叠的三维重构方法。通过引入点对特征、优化采样策略及损失函数,增强了PointNet++在复杂场景下的分割能力;结合CPD算法与局部区域重叠策略,提升了点云配准的鲁棒性和效率。试验结果显示:该方法用于奶绵羊背景分割的准确率和平均交并比分别达到98.78%和97.25%,推理速度为53.4 ms;较原模型平均准确率和平均交并比分别提高了3.04和2.53个百分点,推理时间缩短了45.17%。该方法用于奶绵羊三维配准中,各向异性旋转误差、各向异性平移误差、各向同性旋转误差、各向同性平移误差以及倒角距离分别达到0.0256°、0.0229 m、3.0887°、0.0463 m和0.00789 m,较原始CPD方法均降低。通过与人工体尺测量数据对比,重构模型所提取的体长、体高、十字部高、胸深、胸围等参数的平均绝对百分比误差分别为3.34%、3.07%、3.32%、3.63%和2.81%。该研究方法兼具较高精度与实时性,能够满足一次性重构的需求,可为奶绵羊三维配准与智能化体尺测定提供参考。展开更多
文摘<span style="font-family:Verdana;">The experiment was conducted to evaluate the effect of groundnut haulm and maize bran mixture supplementations on feed intake, digestibility, body weight gain and carcass characteristics of local sheep fed hay basal diet at Salga sheep farm in Assosa district, Western Ethiopia. The experiment was laid out in a randomized complete block design (RCBD) with four treatments consisting of six blocks with four animals per block based on their initial body weight of 20.12 ± 0.05 kg (mean ± SD). Treatments comprised of feeding natural pasture hay ad libitum T1 = 0;T2 = 100% maize bran (MB);T3 = 50% MB and 50% Groundnut haulm (GNH), and T4 = 100% GNH. The amount of supplements offered was 300 g/day/animal on DM basis. The daily feed intake, daily body weight gain, feed conversion efficiency, dry matter and nutrient digestibility, and carcass characteristics parameters were measured during the experimental period. The study result indicates that the crude protein (CP) contents were 7.12% and 11.6%, and the neutral detergent fiber (NDF) contents were 67.9% and 57.5% for natural grass hay and groundnut haulm, respectively. The total DM intake was higher (P < 0.001) in T4 (941 g/day) followed by T3 (937 g/day), and T2 (934 g/day). However, the control group (T1) consumed relatively higher basal dry matter (DM) (767 g/day) as compared to all other groups. Local Sheep supplemented with T4 had significantly different (P < 0.001) FBW (33.2 vs 24.3 kg), FCE (0.17 vs 0.08) and ADG (156.2 vs 46.4 g/day) as compared to the control group. The mean DM, OM, and ADF digestibility in the control group (T1) was significantly lower than the supplemented groups (P < 0.001), but there is no significant difference between supplemented treatments (T2, T3, T4). The CP digestibility was the least in the control group (T1) than the supplemented (76 vs 85.5, 88.8 and 89.3 for T1, T2, T3 and T4, respectively). Furthermore, dressing percentage on slaughter weight and empty body weight basis and rib-eye muscle area were high for T4. Empty body weight and hot carcass weight were higher in T4 (27.5 and 15.2 kg) and T3 (25.5 and 14.1 kg) as compared to the control group (19.8 and 10.3 kg), respectively. Similar to biological performance, the economic analysis also showed that supplementation with T4 resulted in better returns compared to others. Thus, it can be concluded that supplementation in general improved animal performance. Among the supplements, T4 is biologically optimum and economically feasible.</span>
文摘This study aimed to evaluate the performance and potential of development local sheep in sub-district Kaliangkrik. Respondents were taken from sheep farmers in the village Munggangsari and Wonocoyo with the number of livestock ownership of at least two tails. This study used a survey method, with sampling of respondents in the census. The results showed the average number of sheep ownership as much as 0.47 animal units （AU） with a range of 0.14 AU to 1.15 AU. The largest population structure is lamb （25.66%）, ewe （23.03%）, ram （18.61%）, ram lamb （16.92%） and ewe lamb （15.79%）. Sex ratio of ram： ewe is 1：1.5 for adult sheep and 1：1.2 for lambs. Weight of ram is 26.75 kg and ewes 26.37 kg; weight of male lamb is 8.42 kg, with average daily gain （ADG） 48.11 g/head/day, while the female lamb 6.61 kg with ADG 44.13 g/head/day. The average sheep lambing interval was 8.4 months, with an average litter size of 1.3 tails. Based on the calculation of the adequacy of feed, the obtained level of sufficiency （feed production ratio and feed requirement） is 1.89, which means the area has adequate feed production. It was concluded that sheep productivity was good enough and potentially to be developed in Kaliangkrik region.
基金Financial support from the ministry of Energy,Agriculture,Environment,Nature,and Digitalization within the framework of the European Innovation Partnership(EIP Agri).
文摘In recent decades, a considerable number of local breeds have been replaced by high-yielding breeds for reasons of profitability. Many local breeds are now threatened by extinction and the loss of their native genetic diversity. The need to conserve breeds and their genetic diversity has a major importance due to the necessity for genetic change within and between populations. Novel approaches have to be explored and extended to maintain this genetic diversity. The aim of this study was the identification and implementation of breed-specific traits for a small, local sheep breed in northern Germany. The data comprised pedigree information, estimated breeding values (EBVs) of several conventional traits, and phenotypic information from a field experiment for two novel traits: 1) average daily gain under extensive circumstances (ADGE) and 2) ultrasonic measurements of muscle-fat ratio (UMFR). The experimental design included a dataset of 47 progeny from 14 pure-bred rams of German White-Headed Mutton (GWM). The methodical approach was divided into four parts: 1) the analysis of the breeding programme, 2) the identification of breed-specific traits, 3) the estimation and correlation of novel breeding values, and 4) the consequences of implementing these novel traits. Genetic parameters and correlations were conducted by applying linear mixed models. The estimates for the heritability (repeatability) were between 0.70 and 0.83 (0.42 and 0.46). The genetic correlation was positive (0.61) and in accordance with the phenotypic correlation (0.62). Average daily gain under intensive circumstances (ADGI) was moderately positive correlated with muscularity (0.60), as opposed to ADGE, which was moderately negative correlated with muscularity (-0.68). The EBV of ADGE was also moderately positive correlated with UMFR (0.64). Genetic response for ADGE enhanced to values of 481.09 g/day, 639.97 g/day, >700 g/day and >850 g/day for different selection intensity scenarios. Corresponding rates of inbreeding were 1.4%, 2.7%, 5.1%, and 7.9% after 10 years of selection. Genetic response for UMFR increased to 0.92, 1.34, 2.41, and >2.75, whereas remaining rates of inbreeding increased to 1.1%, 2.2%, 5.1%, and 7.9%. ADGI and ADGE were tendentially negatively correlated (-0.11), which strengthen the assumption of a biased ADGI. ADGE has a positive influence on meat-quality aspects (UMFR). Optimal use of reference sires with predefined selection intensity achieves genetic response for ADGE and UMFR with simultaneously acceptable rates of inbreeding.
文摘The reproductive and lamb mortality data (n = 187) of the Local and crosses of Dorper × Local ewes following natural controlled breeding in Ethiopia were analysed. Data were collected during 2009-2011 at Sirinka breeding, evaluation and distribution site, eastern Amhara region of Ethiopia. Breed, lamb sex, birth season, birth year, birth type and ewes’ parity were considered as fixed effects. Data analyses were performed using general linear model procedures. Breed was a significant source of variation: the local sheep attained faster the age at first lambing than the crossbred ewe lambs (469 ± 8.45 vs. 555 ± 6.25 days, p < 0.0001), whereas the crossbred ewes weighed more than the local sheep ewes at the age of first lambing (32.7 ± 0.63 vs. 22.8 ± 0.43 kg, p < 0.0001). Birth year had also important influence on the age and weight at first lambing of ewes. Ewes showed better performance during the later study years, differences attributed due to the improved management advantages in later years. The crossbred and local ewes were comparable in their litter size, despite the fact that the lambing interval of crossbred ewes was longer than the local ewes (306 ± 4.62 vs. 287 ± 2.38 days). Additionally, there was no significant difference in mortality rate between the two breeds. This study confirms that the local ewes had higher annual reproductive rate than that of the crossbred sheep ewes (1.49 ± 0.02 vs. 1.37 ± 0.01 lambs) under the same environmental conditions. The present results suggested that better management and breeding program probably will increase the productivity of the local sheep.
文摘旨在挖掘绵羊中与优异性状相关基因,对遗传改良与育种实践具有重要价值。本研究以93只策勒黑羊、33只皮山红羊和13只瓦格吉尔羊为对象,进行颈静脉采血、DNA提取、基因分型。用PLINK软件对基因型数据进行质量控制(质控标准为:剔除个体检出率小于90%、SNP检出率小于95%、最小等位基因频率小于5%、哈代温伯格平衡P<1×10-6的SNPs)和主成分分析(PCA),构建进化树、群体祖先成分分析和连锁不平衡分析(LD),同时基于全基因组长纯合片段(runs of homozygosity,ROH)分析和群体遗传分化指数(F_(ST))分析,选择前10%的ROH片段作为高频区域和F_(ST)值的前5%位点作为受选择区域,参考绵羊基因组Oar_v4.0注释基因并进行GO和KEGG分析。F_(ST)和FROH结果表明,3个群体之间遗传分化水平较低,且在K=4呈现清晰的遗传背景分化。同时识别出ACVR1、ACVR1C、UPP2、CRY1和NR4A2等是南疆地方绵羊品种在干旱沙漠环境中形成遗传适应性的候选基因。本研究通过群体遗传结构多样性和选择信号分析,揭示了南疆地方绵羊品种的遗传变异特征,从多维度的遗传变异视角寻找到相关优异基因,为绵羊种质资源保护、新品种培育及资源多样性提升提供了重要参考依据。
