Quick Guide to Cattle Terms - The Smallholder Series
www.smallholderseries.co.uk › ... › Glossary & Quick Guides
Multiparous - female animal that has had two or more pregnancies resulting in viable offspring. Maiden Heifer/Bulling Heifer - heifer before going the bull.

Age of beef heifers at first mating | Breeding | Beef | Livestock ...
agriculture.vic.gov.au/.../beef/.../age-of-beef-heifers-at-first-matin...
Well-managed heifers calving first at two years have a higher lifetime productivity than heifers calving first at older ages. Although some producers believe that ...

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Note added at 8 mins (2018-10-01 15:01:24 GMT)
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Vaquillonas=heifers

ENTORAR - Definición y sinónimos de entorar en el diccionario español
https://educalingo.com/es/dic-es/entorar
La definición de entorar en el diccionario castellano es echar el toro a las vacas para que las sirva.

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Note added at 6 hrs (2018-10-01 20:55:16 GMT)
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As for heifer meaning young cow that has never calved, it is not strictly true.

Definition of heifer:
(in farming) a cow that has not borne a calf, or has borne only one calf.
https://en.oxforddictionaries.com/definition/heifer

Otherwise the term pregnant heifer would not exist:

heifers | companies - Europages
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We can supply you: -Breeding Cattle -Pregnant heifers -Non Pregnant heifers ... FARMING | hereford cattle | hereford bull | hereford cattle for sale uk

vaquillona f (plural vaquillonas)
(Latin America) A heifer of between two and three years of age
https://en.wiktionary.org/wiki/vaquillona

Vaquillona is just heifer, but here a distintion has been made, that these are "sin entorar"--unmated heifers.

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Note added at 1 day 4 hrs (2018-10-02 19:42:42 GMT) Post-grading
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Thanks, glad to be of help!