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Shamuyarira Kwame Wilson Shimelis Hussein Tapera Terence Tsilo Toi John 《Journal of Crop Science and Biotechnology》2019,22(2):169-176
Journal of Crop Science and Biotechnology - Genetic variation and heritability estimates in early generations are important in identifying superior families that can be targeted for genetic... 相似文献
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Ndengu Masimba Matope Gift Tivapasi Musavengana Scacchia Massimo Bonfini Barbara Pfukenyi Davis Mubika de Garine-Wichatitsky Michel 《Tropical animal health and production》2018,50(5):1107-1117
Tropical Animal Health and Production - A study was conducted to investigate the seroprevalence and associated risk factors of Chlamydia abortus infection in cattle and some selected wildlife... 相似文献
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Ncube Sharai Saidi Petronella Tapiwa Tivapasi Musavengana Tapera Imbayarwo-Chikosi Venancio Edward Halimani Tinyiko Edward 《Tropical animal health and production》2018,50(3):665-670
Tropical Animal Health and Production - The objective of the study was to determine serum lipid, enzyme, and hematological responses of broilers to Acacia angustissima leaf meal. Acacia... 相似文献
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Ramadimetja Prescilla Mohlatlole Evelyn Madoroba Farai Catherine Muchadeyi Michael Chimonyo Arnold Tapera Kanengoni Edgar Farai Dzomba 《Tropical animal health and production》2013,45(6):1399-1405
Enterotoxigenic Escherichia coli (ETEC) and shiga toxin E. coli (STEC) are important causes of colibacillosis in piglets. Recently, enteroaggregative E. coli heat-stable enterotoxin 1 (EAST-1) has been implicated in pig diarrhoea. This study investigated the prevalence of enterotoxin [heat-labile toxins (LT), heat-stable toxin a (STa), heat-stable toxin b (STb)], shiga toxins (Stx1, Stx2, Stx2e), enteroaggregative heat-stable E. coli (EAST-1), associated fimbriae (F4, F5, F6, F41, F18ab, F18ac) and non-fimbrial adhesins [adhesin involved in diffuse adherence 1 (AIDA-1), attaching and effacing factor, porcine attaching- and effacing-associated factor] in South African pigs. A total of 263 E. coli strains were isolated from Landrace (n?=?24), Large White (n?=?126), Duroc (n?=?28) and indigenous (n?=?85) breeds of piglets aged between 9 and 136 days. PCR was used in the analysis. Virulent genes were detected in 40.3 % of the isolates, of which 18.6, 0.4 and 17.5 % were classified as ETEC, STEC and enteroaggregative E. coli (EAEC), respectively. Individual genes were found in the following proportions: STb (19.01 %), LT (0.4 %), STa (3.4 %), St2xe (1.1 %) and EAST-1 (20.2 %) toxins. None of the tested fimbriae were detected in ETEC and STEC isolates. About one third of the ETEC and STEC isolates was tested negative for both fimbrial and non-fimbrial adhesins. Twenty-five pathotypes from ETEC-, EAEC- and STEC-positive strains were identified. Pathotypes EAST-1 (30.2 %), STb (13.2 %) and STb/AIDA-1 (10.4 %) were most prevalent. The study provided insight on possible causes of colibacillosis in South African pigs. 相似文献
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Kanga JS Kanengoni AT Makgothi OG Baloyi JJ 《Tropical animal health and production》2012,44(7):1797-1802
A study was carried out to determine voluntary forage intake and nutrient digestibility in growing pigs fed a mixed forage and concentrate diet. Twenty-five 8-week-old Large White?×?Landrace crossbred male pigs (27?±?3.8?kg) were blocked by weight into five groups, and each was randomly allocated to four indoor treatments (A, B, C, and D), which received 100, 90, 80, and 70?% of ad lib concentrated intake and an outdoor treatment (E) that received 80?% of ad lib concentrate. Indoor treatments were either fed the concentrate only (A) or also received freshly cut Kikuyu grass (Pennissetum clandestinum) ad libitum (B, C, and D), while pigs on treatment E were reared outdoors in Kikuyu grass paddocks. There was a significant correlation between the amount of concentrate offered and its intake (P?0.01). The intake of Kikuyu was similar among treatments (P?>?0.05). Mean acid-insoluble ash digestibility estimates of organic and dry matter were superior to C(32) estimates (P?0.05). Kikuyu intake was higher (P?0.05) than the estimated intake by 0.076?±?0.03?kg. It was concluded that Kikuyu intake was not affected by the reduction of the concentrate allowance, and this should be taken into consideration when feeding pigs on pasture. 相似文献
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