Glossary entry (derived from question below)
Portuguese term or phrase:
..20 cidades, os quais detêm 50% do efetivo bovino brasileiro
English translation:
half of all the cows in Brazil
- The asker opted for community grading. The question was closed on 2016-08-02 09:54:07 based on peer agreement (or, if there were too few peer comments, asker preference.)
Portuguese term
Australia
Portuguese, English
Native in: English 
, Portuguese (Variant: Brazilian)
Works in: Portuguese to English, English to Portuguese
..20 cidades, os quais detêm 50% do efetivo bovino brasileiro
I thought "effective cattle population" would do in this case, though I am unsure of what "efetivo" really means in this context! Is it referring to "effective population size" maybe?
https://en.wikipedia.org/wiki/Effective_population_size
Proposed translations
Portugal
Business Language Solutions Pt>Eng
Native in: English
Works in: Portuguese to English, English to Portuguese
half of all the cows in Brazil
| agree |
Andrew Bramhall
: Yep, 20 towns are responsible for half of all Brazil's cows
37 mins
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thanks Oliver
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| agree |
Mario Freitas
: What about the bulls and the oxen? Just kidding. Of course. I have it. But the Sex Pistols were never any good in agribusiness.
8 hrs
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Ever hear of the record 'never mind the bollocks'? :-)
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| agree |
Nick Taylor
: Which half? Front or back? Never mind the Bullsh*t!
3 days 3 hrs
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Will do!
Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
Brazilian bovine stock
Another example:
and tenants and those undertaken by cattle farmers during the 1865–67 outbreak of rinderpest in Britain, which claimed 6 per cent of the national bovine stock.
here is a positive relationship between in-milk bovine stock and operational holding; larger sized holdings could maintain larger bovine stock.
To the above mentioned factors, it should be added that the national bovine stock (9,583,000) is almost exclusively Bos taurus since the breeding of Bos indicus ...
http://agenciabrasil.ebc.com.br/en/economia/noticia/2015-10/bovine-stock-brazil-grew-03-2014
| Thanks Ana, I like 'bovine stock' |
| neutral |
Andrew Bramhall
: agree with ' bovine stock' as an option, but ' holds' is the wrong word in terms of livestock; if we were talking coal, diamonds or gold stocks, then fair enough.
48 mins
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OK, Oliver... if you agree with "bovine stock", why "neutralize" my suggestion... ;)
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| agree |
Erzsébet Czopyk
: I vote for bovine stock
1 hr
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Obrigada!
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Brazil
Technical - Fast - good price - accurate
Native in: English (Variant: US) , Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English, English, and 1 more.
20 cities which hold 50% of the actual Brazilian cattle population
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Note added at 4 hrs (2016-07-30 11:17:45 GMT)
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alternative:
20 cities which hold 50% of the actual Brazilian bovine population
Low levels of taurine introgression in the current Brazilian Nelore and ...
www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC)
by AMP O’Brien - 2015 - Cited by 4 - Related articles
Apr 17, 2015 - Brazil has the second largest bovine population in the world [1] with .... higher levels of African taurine ancestry than those in the full dataset, ...
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
Discussion
It designates "total (actual) number".
It is a more formal / scientific / technical term. Of course there are other (more colloquial) terms you could use.
Please see examples below.
http://context.reverso.net/traducao/portugues-ingles/efectiv...
Please search "efetivo animal" here:
http://eur-lex.europa.eu/legal-content/EN-PT/TXT/?uri=CELEX:...
https://www.google.pt/webhp?sourceid=chrome-instant&ion=1&es...