THE NATIVE SHEEP OF SRI LANKA

1984 ◽  
Vol 2 ◽  
pp. 27-30
Author(s):  
L.A. Goonewardene ◽  
V. Ravindran ◽  
K. Nadarajah ◽  
R. Rajamahendran
Keyword(s):  
Sri Lanka ◽  
Management Systems ◽  
Reproductive Parameters ◽  
Traditional Management ◽  
Need To Evaluate ◽  
Native Sheep

SUMMARYThe native sheep of Sri Lanka is described, and its growth and reproductive parameters under traditional management systems are reported. The need to evaluate this sheep under optimal nutritional and husbandry conditions is highlighted.

scholarly journals Ultrastructural analysis of the spermatogenesis in the guinea pig (Cavia porcellus)

2016 ◽  
Vol 36 (suppl 1) ◽  
pp. 89-94 ◽  
Author(s):  
Luciana S. Simões ◽  
Rose E.G. Rici ◽  
Phelipe O. Favaron ◽  
Taís Harumi de Castro Sasahara ◽  
Rodrigo S.N. Barreto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Guinea Pig ◽  
Sexual Development ◽  
Morphological Changes ◽  
Light And Electron Microscopy ◽  
Management Systems ◽  
Cavia Porcellus ◽  
Reproductive Parameters ◽  
Development Stages ◽  
Transmission Electron

Abstract: al for both, the establishment of appropriate management systems, and for the use of new species as animal models. In this study, we used light and electron microscopy to characterize the sexual development stages of the guinea pig (Cavia porcellus) in specimens of 30, 45 and 90 days of age. We observed the differentiation of spermatocytes only through transmission electron microscopy in the leptotene, zygotene and pachytene phases of meiosis, in 30-day-old animals. During puberty, there was differentiation of the germinative epithelium and formation of the acrosome. Spermatozoa, however, were not detected. Thus, we could infer that puberty happens after 45 days of age. Sexual maturity was evident in 90-day-old specimens. Our results showed that changes in the testicular germinative epithelium during the postnatal sexual development in guinea pig led to morphological changes, including the ones related to the development of Leydig and Sertoli cells, which are directly related to puberty. In this work, we provide new morphological subsidies for a better understanding of reproductive parameters of this species, enabling its use as an animal model in the field of the reproductive biology.

The Cattle and Buffalo of Africa: Management

1995 ◽  
Vol 24 (3) ◽  
pp. 155-161 ◽  
Author(s):  
D. H. Hill
Keyword(s):  
Environmental Impact ◽  
Genetic Improvement ◽  
Management Systems ◽  
Traditional Management ◽  
African Cattle

This article on the types, breeds and management of cattle and buffalo in Africa describes both traditional management systems and recent innovations, and considers the factors determining productivity, the environmental impact of pastoralism and the genetic improvement of African cattle.

scholarly journals PRODUCTION AND ECONOMIC CHARACTERISTICS OF GOAT MANAGEMENT SYSTEMS IN VAVUNIYA DISTRICT, SRI LANKA

2018 ◽  
Author(s):  
M Sarmini ◽  
◽  
S Premaratne ◽  
S Kalpana ◽  
◽  
...  
Keyword(s):  
Sri Lanka ◽  
Management Systems
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