Growth And Testicular Characteristics Of The Indigenous Nigerian Native And Exotic Largewhite X Landrace Boars Experimentally Infected With

SSA Research CHIMA CHIJIOKE I. 231 PAGES (64481 WORDS) Thesis
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ABSTRACT

Tolerance to African animal trypanosomosis (AAT) among several animal species involves a

wide milieu of factors which modulate the animal’s response to the disease and is considered a

breed attribute. To investigate the effect of breed on tolerance/resilience to trypanosome

infection on pubertal boars, nine (9) Nigerian Native and nine (9) Large-White x Landrace

crossbreed boars were experimentally inoculated with laboratory samples of Trypanosoma

brucei brucei. Their comparative responses with regard to clinical symptoms, growth parameters,

histopathological and histometrical features of the testis, Sertoli and germ cell numbers and

spermatogenic output including cell ratios and daily sperm production were studied over two

study periods- 63 days post infection (63d p.i.) and 98 days post infection (98d p.i.). Results

obtained indicated that infected boars of both breeds were clearly parasitaemic in the first study

period, with a significant (P<0.05) reduction observed in the native boars by 98d p.i. The general

trend in the results obtained showed significant (P<0.05) differences in the various parameters,

with the Nigerian Native boars exhibiting strong marginal gains by the second study period. This

was not the case with the exotic Large-White x Landrace boars and suggested that the native

boars possessed a superior ability to mitigate the more severe effects of the pathology and a

tendency to return to normal. With respect to the clinical features investigated, the Nigerian

Native boars presented significantly (P<0.05) higher values with respect to parasitaemia log

values, rectal temperatures, as well as packed cell volume. Histopathological findings revealed

that lesions, including tubular distortion, denudation of basement membrane, seminiferous

epithelial damage led to the distortion of the architecture of the seminiferous epithelium as well

as degradation of the inter-tubular compartment and values were significantly (P<0.05) lower

among the native boars. The parameters on growth showed the nutrient-parasite interaction was

influenced by breed attributes. Biometrical and linear body measurements were affected

significantly (P<0.05) less in the native boars than in the exotic boars. Weight loss was

minimized among the native boars with a tendency to significantly (P<0.05) increase growth rate

as during the second study period, whereas this trend was not clearly observed among the exotic

boars. The effect of the infection on clinical and histopathological features, as well as growth

responses and especially in relation to the testes’ capacity for spermatogenesis was studied. We

observed significant (P<0.05) reductions in testes weight, somatic and germ cell populations and

also significant (P<0.05) reductions in the overall kinetics of spermatogenesis and daily sperm

production. The mechanisms of action implicated in breed responses to the pathology appeared

to relate to phenotypic characteristics as well as innate mechanisms which are known to

modulate the pathogenesis of trypanosomosis. Equally the lowered parasitaemia observed among

the native boars suggested that toxicological effects of trypanosomes on this breed of boars were

limited. It was concluded that the Nigerian Native boars possessed an attribute that could reverse

the adverse patho-physiological effects of T. b. brucei infection and were therefore more resilient

to T. b. brucei infection than the exotic Large-White x Landrace boars.

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APA

SSA, R (2021). Growth And Testicular Characteristics Of The Indigenous Nigerian Native And Exotic Largewhite X Landrace Boars Experimentally Infected With. Afribary.com: Retrieved May 08, 2021, from https://afribary.com/works/growth-and-testicular-characteristics-of-the-indigenous-nigerian-native-and-exotic-largewhite-x-landrace-boars-experimentally-infected-with

MLA 8th

Research, SSA. "Growth And Testicular Characteristics Of The Indigenous Nigerian Native And Exotic Largewhite X Landrace Boars Experimentally Infected With" Afribary.com. Afribary.com, 02 May. 2021, https://afribary.com/works/growth-and-testicular-characteristics-of-the-indigenous-nigerian-native-and-exotic-largewhite-x-landrace-boars-experimentally-infected-with . Accessed 08 May. 2021.

MLA7

Research, SSA. "Growth And Testicular Characteristics Of The Indigenous Nigerian Native And Exotic Largewhite X Landrace Boars Experimentally Infected With". Afribary.com, Afribary.com, 02 May. 2021. Web. 08 May. 2021. < https://afribary.com/works/growth-and-testicular-characteristics-of-the-indigenous-nigerian-native-and-exotic-largewhite-x-landrace-boars-experimentally-infected-with >.

Chicago

Research, SSA. "Growth And Testicular Characteristics Of The Indigenous Nigerian Native And Exotic Largewhite X Landrace Boars Experimentally Infected With" Afribary.com (2021). Accessed May 08, 2021. https://afribary.com/works/growth-and-testicular-characteristics-of-the-indigenous-nigerian-native-and-exotic-largewhite-x-landrace-boars-experimentally-infected-with