Breeding involves selective mating of cows with
matched sires, and a marketing policy that targets
unproductive cows. Less than 2 percent of the males
are used for reproduction. Close monitoring of the
herd allows early detection of oestrus and ensures
that more than 95 percent of births result from matchmaking
with selected males. A different sire is used
for almost every oestrus of a particular cow, with
an overall ratio of about one sire every four births.
Pedigree sires are borrowed across large networks
of (often related) breeders. Sire borrowing remains
frequent (affecting about half the births) even when
a breeder owns pedigree sires of his own. Matchmaking
with non-pedigree sires, owned or borrowed,
affects about 12 percent of births. Both practices are
maintained explicitly in order to preserve variability.
Matrilineal genealogies and the sire of each animal
in the herd are usually remembered, together with
pedigrees of special sires, and the identity and owner
of all borrowed sires.
Breeding involves selective mating of cows withmatched sires, and a marketing policy that targetsunproductive cows. Less than 2 percent of the malesare used for reproduction. Close monitoring of theherd allows early detection of oestrus and ensuresthat more than 95 percent of births result from matchmakingwith selected males. A different sire is usedfor almost every oestrus of a particular cow, withan overall ratio of about one sire every four births.Pedigree sires are borrowed across large networksof (often related) breeders. Sire borrowing remainsfrequent (affecting about half the births) even whena breeder owns pedigree sires of his own. Matchmakingwith non-pedigree sires, owned or borrowed,affects about 12 percent of births. Both practices aremaintained explicitly in order to preserve variability.Matrilineal genealogies and the sire of each animalin the herd are usually remembered, together withpedigrees of special sires, and the identity and ownerof all borrowed sires.
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