Results 71 to 80 of about 840,256 (209)

Wildlife substitution equivalents based on metabolisable energy for calculating stocking densities on Southern African wildlife ranches

South African Journal of Animal Science
This study aims to bridge the gap between the large stock unit method and the grazer and browser unit methods for estimating the stocking densities of wild herbivore ungulates on wildlife ranches and reserves using both extensive and intensive ...
CA Shepstone, N van Rooyen, MW van Rooyen, J du P Bothma, REJ Burroughs   +4 more
doaj   +1 more source

Efeito do tipo de sistema de criação nos resultados econômicos de sistemas de produção de leite na região de Lavras (MG) Effect of the type of breeding system on the economical results of milk production systems in Lavras region (MG)

Ciência e Agrotecnologia, 2004
Objetivou-se com esta pesquisa estudar a rentabilidade da atividade leiteira de sistemas de produção de leite na região de Lavras/MG, analisando a influência do tipo do sistema de criação sobre o custo de produção do leite.
Marcos Aurélio Lopes, André Luis Ribeiro Lima, Francisval de Melo Carvalho, Ricardo Pereira Reis, Íris Cristina Santos, Fernanda Helena Saraiva   +5 more
doaj   +1 more source

Floral biology and pollination in Brazil: history and possibilities

Acta Botânica Brasílica
Pollination research in Brazil virtually started with Fritz Muller, whose insights supported Darwin's evolutionary theory. Pollination systems of Brazilian plants were studied mainly by travelling researchers until early last century when native or ...
Paulo Eugênio Oliveira, André Rodrigo Rech   +1 more
doaj   +1 more source

Outcrossing rate of safflower (Carthamus tinctorius L.) genotypes under the agro climatic conditions of Northern Germany [PDF]

, 2008
Safflower oil is considered to be one of the highest quality vegetable oils for human nutrition, containing up to 90% linoleic acid. The cultivation of safflower would enlarge the number of species to increase biodiversity and widen crop rotation.
Becker, Heiko C., Rudolphi, Sabine, von Witzke-Ehbrecht, Sabine   +2 more
core  

A view from above : changing seas, seabirds and food sources [PDF]

, 2009
In this review we summarize what is known about mechanisms by which climate change may be affecting the populations of seabirds around the UK. Breeding success and adult survival are the key factors affecting changes in seabird populations, and food ...
Edwards, M., Furness, R., Heath, Michael, Pinnegar, J., Wanless, S.   +4 more
core  

Plant Mating Systems Often Vary Widely Among Populations

Frontiers in Ecology and Evolution, 2018
Most flowering plants are hermaphroditic, yet the proportion of seeds fertilized by self and outcross pollen varies widely among species, ranging from predominant self-fertilization to exclusive outcrossing.
Michael R. Whitehead, Michael R. Whitehead, Robert Lanfear, Randall J. Mitchell, Jeffrey D. Karron   +4 more
doaj   +1 more source

Penentuan Sistem Penangkaran Rusa Timor (Rusa Timorensis De Blainville 1822) Berdasarkan Jatah Pemanenan Dan Ukuran Populasi Awal [PDF]

, 2012
Harvest quota and population size could be used to determine deer captive breeding system. Development Center of Deer Captive Breeding Technology at Dramaga Research Forest (DRF) is one of captive breeding projected to be one of professional institution ...
Kartono, A. P. (Agus), Kwatrina, R. T. (Rozza), Santosa, Y. (Yanto)   +2 more
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Demographic performance of local sheep and goat breeds in two agro-ecological zones in Egypt [PDF]

, 2019
Small breeders in Egypt raise locally adapted sheep and goats breeds, which have the ability to produce and reproduce under the prevailing harsh conditions.
Abdel-Sabour, T., Aboul Naga, A.M., Alary, Véronique, El-Sayed, M., Mansour, H., Messad, Samir, Osman, Mona-Abdelzaher, Valls, Hugo   +7 more
core  

Impact of a heterogeneous environment on the population expansion of the harmful plant Iris ruthenica Ker-Gawl. in the high mountain grasslands

Frontiers in Plant Science
Iris ruthenica Ker-Gawl. (Russian iris) is a perennial, clonal, herbaceous plant that is spread across the degraded mountain grasslands in northern Xinjiang.
Gulinige Tayier, Dilixiati Hasimu, Tayierjiang Aishan, Amanula Yimingniyazi   +3 more
doaj   +1 more source

Sustainable organic plant breeding: Final report - a vision, choices, consequences and steps [PDF]

, 1999
In general, the characteristics of organic varieties - and by extension of organic plant breeding - differ from that of conventional breeding systems and conventional varieties.
den Nijs, A.M.P., Haring, M., Hulscher, M., Jongerden, J., Lammerts van Bueren, E.T., Ruivenkamp, G.T.P., van Mansvelt, J.D.   +6 more
core   +1 more source