Abstract:
:Cows carrying unrelated transferred embryos (ET) produced anti-leucocyte serum antibodies (aLA) more often than cows carrying their own embryos. Cows carrying the ET showed a higher frequency of cytotoxic reactions against leucocytes from 40-60 randomly chosen cows than individuals carrying their own embryos. The percentage of animals with aLA was higher in cows carrying their second or third transferred embryo than in those with their first transferred embryo. There was no change in the frequency of cytotoxic reactions with repeated pregnancies from transferred embryos. There was no difference in the toxicity of aLA in normal pregnant cows and those carrying transferred embryos. Embryonic mortality (EM) of 35, 73 and 88% was noted during pregnancies from the first, second and third successful ET, respectively. Mortality of 48% occurred in the first pregnancy following an unsuccessful ET. Embryonic mortality of 31% occurred in cows simultaneously carrying their own and a transferred embryo. A direct relationship between the presence of aLA and EM in recipients was not proved. Other fertility problems may lead to EM in cows subjected to repeated transfer of foreign embryos.
journal_name
Anim Genetjournal_title
Animal geneticsauthors
Matousek J,Ríha Jdoi
10.1111/j.1365-2052.1991.tb00674.xsubject
Has Abstractpub_date
1991-01-01 00:00:00pages
245-50issue
3eissn
0268-9146issn
1365-2052journal_volume
22pub_type
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