Practical possibilities of blood grouping for parentage information: A pilot study in Zaire

Studies the effectiveness of the blood grouping technique for parentage identification of cattle at the Mvuazi research station, Bas-Zaire, Zaire

Can PCV be used as an indicator of trypanosomiasis and production level in cattle?

Results of a study conducted to estimate the importance of factors influencing blood packed cell volume (PCV) and to investigate possible relationships between PCV and reproductive & liveweight performance of N'Dama cattle exposed and not exposed to trypanosomiasis under the same system of management on two ranches in Zair

Productivity of ranch N'Dama cattle under trypanosomiasis risk

Discusses the productivity of N;Dama cattle at Kolo and Mushie ranches (Zaire). Includes data on productivity under zero (Kolo) and high (Mushie) trypanosomiasis risk (1984-86). Compares the productivity of Boran and N'Dama cattle under ranch management at five sites in Africa

Productivity of ranch N'Dama cattle under trypanosomiasis risk

N’Dama cow and calf viabilities, parturition intervals, cow parturition and weaning weights and calf weaning weights were recorded during a three year period, January 1984 to December 1986. The management system was the same at Mushie and Kolo ranches (Zaire) where trypanosomiasis risk was high and zero, respectively. The average calving interval at kolo was about two months (16%) shorter than at Mushie Ranch, the respective means being 426 and 493 days. The corresponding calculated calving percentages were 85.7% for Kolo and 74.0% for Mushie. Live weight performance was better in Kolo than in Mushie for all liveweight characters considered. All the 3 cow productivity indices showed that, cows at kolo were more productive than cows at Mushie. Herd productivity index. The similar productivities of N’Dama cattle at two ranches with contrasting trypanosomiasis risk levels, but which were other wise comparable, confirms that at this level of risk trypanosomiasis is not a major factor affecting the productivity of this trypanotolerant breed

Determination of tsetse challenge and its relationship with trypanosome prevalence in trypanotolerant livestock at sites of the African Trypanotolerant Livestock Network

Reports the determination of tsetse challenge at sites of the African Trypanotolerant Livestock Network and its relationships with trypanosome prevalence for the period 1984-1986. Lists the Network sites with trypanotolerant cattle or sheep together with the tsetse species detected. Discusses tsetse species captured, tsetse relative density, trypanosome infection rates and infection types in tsetse, and tsetse challenge and trypanosome prevalence in trypanotolerant livestock

Determination of tsetse challenge and its relationship with trypanosome prevalence in livestock within the African Trypanotolerant Livestock Network

Determines the tsetse challenge and its relationship with trypanosome prevalence in livestock at eleven sites within the African Trypanotolerant Livestock Network. Includes tsetse species, their distribution, habitats, and relative density; trypanosome infection rate; and frequency of vivax and congolense - type infection; also shows the overall tsetse challenge determined from the product of relative density; and tsetse challenge and trypanosome prevalence for trypanotolerant and other cattle herds

Factors influencing liveweight in a range of network situations

The health and performance records of cattle and sheep used were collected over a three-year period, 1984-1986, at four network sites. Three of the sites, Avetonou (Togo), Boundiali (Cote d’Ivoire) and Mushie (Zaire) were chosen because of their high mean trypanosome of the live weight performance, and the fourth site, Kolo (Zaire), was chosen to give estimates of the liveweight performance of trypanotolerant cattle at zero trypanosomiasis risk. Trypanosome prevalence significantly depressed the live weight performance of N’Dama cattle at Mushie, but the effects at the other sites, although generally in the same direction as those at Mushie, did not reach statistical significance (p>0.05). At Mushie trypanosome infection of the N’Dama cow during gestation did not affect her parturition weight, but in the infection occurred during the last 3 months pre-partum then the birth weight of her calf was depressed significantly. The results relating PCV & live weight traits showed that a low PCV associated with poor live weight performance and a high PCV with better performance. Result from the Mushie, Kolo and Avetonou showed a positive relationship of mean PCV in the calf pre-weaning with pre-weaning growth and weaning weight. Trypanosome infection in the ewe, as measured by the number of parasitaemic months during gestation and/or lactation, did not depress her subsequent body weight, nor was there any cumulative effect of trypanosome infection pre and post-partum on ewe weight at weaning, nor on ewe weight change during the lactation, Similarly lamb weaning weight and lamb pre-weaning growth were not affected lamb weaning weight and lamb pre-weaning growth were not affected by one or more parasitaemic months in the ewe during lactation

Factors influencing liveweight in a range of network situations

Discusses factors influencing liveweight in a range of trypanotolerance network situations. Analyses liveweight traits, viz, dam liveweights at parturition and weaning, dam liveweight change between parturition and weaning, progeny liveweights at birth and weaning and progeny pre-weaning daily gain

Health and performance of trypanotolerant cattle breeds exposed to quantified trypanosomiasis risk at five sites within the African Trypanotolerant Livestock Network

A study of tsetse populations and the health and performance traits of one or more trypanotolerant cattle breeds (N'Dama, Baoule and race locale) at five sites in West and Central Africa between 1983 and 198

Genetic and environmental factors affecting the epizootiology and pathogenesis of trypanosomiasis in livestock at eight sites within the African Trypanotolerant Livestock Network

Studies the influence of livestock species, breed, age and lactational status on the prevalence, species and intensity of trypanosome infection in livestock at eight sites of the African Trypanotolerant livestock network in west, Central, and East Africa. Estimates the effect of trypanosome infections on the blood packed cell volume (PCV) of cattle for four characters, average PCV during gestation, at parturition, pre-weaning and at weaning. Reports also the effects of trypanosome infections on livestock viability, reproductive performance and live weights