https://repository.sustech.edu/handle/123456789/16975 2026-04-11T15:28:40Z https://repository.sustech.edu/handle/123456789/16978 Effect of Mastitis on the Reproductive Performance of Holstein Frisian Cows in Northern Gezira Dairy Project (Al Bagair) Zainalabdein , Hatim A.; Elfagir , Ismail M. Abstract The aim of this study was to investigate the effect of mastitis on reproductive performance of Holstein Frisian cattle reared in the farm of the Arab Company for Agricultural Production and Processing (ACAPP), about 40 km south of Khartoum at Al Bagair area. A total number of 4893 recorded cases of mastitis covering the period from 1990 to 1999 were studied for their effect on reproductive performance under the prevailing management and environmental conditions. The traits examined were calving interval (CI), days open (DO), and numbers of services per conception (NSC).Data were subjected to statistical analysis of variance. The results obtained showed that the overall mean (CI), (DO), and (NSC), were 394 ± 45.87 days, 110.21 ± 45.75 days, and 2.81 ± 1.1-63 respectively. The mean (CI) was highly significantly (P? 0.01) affected by the level of mastitis (MS). The results revealed were (403.00± 50.65, 399.03± 49.33, 388.40 ± 40.60) at high, medium, and low level of (MS) respectively. The effect of (MS) on (DO) was highly significant (P? 0.01) the results obtained for (DO) were (117.27± 50.75, 114.69± 49.25, and 104.70±40.54). The effect on (NS/C) was also highly significant (P? 0.01). The results obtained for (NS/C) were (3.07±1.89, 2.92± 1.74, 2.63 ± 1.41) at high, medium, and low level of (MS) respectively. It is concluded that mastitis had significantly affected the reproductive performance of Holstein Friesian cows in the farm under study. article 2016-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16976 Improving Vegetative Propagation of Mango Omer , Abdelatif Elkheir; Said , Abdel Gaffar Elhag; Mohamed , Tag el Sir Ibrahim Abstract An experiment was conducted during three consecutive years (2010, 2011 and 2012) at the nursery of the Faculty of Agricultural science, University of Dongola, Northern State, Sudan, to study the effects of season of the year, selected pre-graft cultural treatments on scion graft take and subsequent scion shoot growth and development of mango (Mangifera indica L.) Three pre-cultural practices were used; namely, defoliation, decapitation and a combination of defoliation and decapitation of the source branches of scion shoots. All scion shoots were collected from a single e “Abu Samaka” tree during the winter and summer seasons of each year from defoliated, decapitated, and defoliated and decapitated branches two weeks prior to grafting. Ten-to twelve- months old “Kitchiner” seedlings were used as rootstock. Grafted seedlings were kept under lath house conditions. Scions grafted during winter gave significantly higher percentage of successful graft than their summer grafted ones irrespective of the cultural treatment. Also all cultural treatments gave significantly high scion graft success relative to the control in both seasons with no significant difference between them. However, the highest percent graft success, the greatest number of scion shoots, the longest shoots, and the largest number of leaves were obtained with defoliation compared with the control or the cultural treatments tested. Both season and cultural practices tested had little or no effect on scion number, elongation and leaf number responses. article 2016-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16977 Detection of β- Lactamases Genes in some Salmonella Isolated from Poultry in Khartoum North, Sudan Alseed , Alnazeer G.; Rodwan , K.; Mohamed , Layla I. Abstract The occurrence of extended spectrum beta lactamases genes in bacteria (ESBLs) is one of the problems that facing the world now in treatment of bacterial infection. This study was conducted to detect CTX-M, SHV, and TEM genes in ESBLs producing Salmonella gallinarum and Salmonella pullorum. All Salmonella strains were isolated from samples collected from poultry farms located in Khartoum north and identified with conventional methods. Bacterial DNA was extracted from each isolate (S.pullorum, S.gallinarum) using boiling method. PCR was used to detect TEM, SHV, and CTX-M genes. The results showed that the genotypic resistance that is mediated by ?-lactamases genes in S. gallinarum was (100%) for SHV followed by CTX-M and TEM genes both (58%) and in S. pullorum was (44%) for CTX-M then TEM (33%) and finally SHV genes (11%). article 2016-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16981 The Effect of Replacement of Maize for Sorghum on Broiler Performance and Some Carcass Characteristics Ahmed , Mohamed Elamin; Abbas , Talha Elsadig Abstract An experiment was conducted to evaluate the influence of replacing maize for sorghum grains in broiler diets on growth performance, carcass yield and some economic aspects. One hundred fifty one day-old Ross 308 broiler chicks were purchased from commercial hatchery. Chicks were sorted by initial live body weight (44.81 ±1.40 g). These chicks were randomly assigned to 15 pens (1x1m) with 10 birds per pen. The chicks were divided into five dietary treatments; three replicates each. Starter and finisher experimental diets were 0% maize replacement for sorghum (control), 25% maize replacement for sorghum, 50% maize replacement for sorghum, 75% maize replacement for sorghum and 100% maize replacement for sorghum were fed through the experimental period of 42 days. Data were analyzed in completely randomized design using the general linear model (GLM) procedure. Live performance parameters, were not significantly (P?0.05) influenced by dietary treatments except for body weight gain and FCR during finisher and overall period. Birds fed on 50% replacement performed better versus others. During starter and finisher phase feed intake and body weight gain for birds on 50% replacement increased by (6.41 and 1.22%) and (7.13 and 3.56%), respectively versus control. Relative weight of breast, thigh and drumsticks and meat bone ratio of breast, thigh, drumsticks and internal organs were not significantly (P?0.05) affected by dietary treatments. Economics analysis showed that feed cost per 1 Kg was the lowest in sorghum-based feed followed by 50, 25, 100 and 75% maize replacement. Cost index was lowest in sorghum-based feed followed by 50, 25, 100 and 75% maize replacement for sorghum. Sorghum-based feed accomplish highest economic efficiency index followed by 50, 25, 100 and 75% maize replacement. Based on these results, it concluded that 50% sorghum replacement for maize is sufficient to assure good performance. article 2016-01-01T00:00:00Z