REPRODUCTIVE PERFORMANCE OF FINNISH LANDRACE EWES MATED TWICE YEARLY
نویسندگان
چکیده
منابع مشابه
A comparison of Dorset and Finnish Landrace crossbred ewes.
Data from 644 exposures and 552 lambings were used to analyze reproductive traits of 1/2-Finnish Landrace, 1/2-Dorset ewes (1/2 Finn); 1/4-Finnish Landrace, 3/4-Dorset ewes, (1/4 Finn) and Dorset ewes. Ewes were exposed to Hampshire or Suffolk rams for spring lambing from 1973 to 1978. The analytical model included fixed effects of ewe birth year (EBY), ewe breed (BR), lambing year within EBY a...
متن کاملReproductive and productive performance in Chios ewes mated in spring or in autumn.
One hundred and sixty adult ewes of the Chios breed were divided randomly into two groups. One group was used for breeding in spring (S) and the other in autumn (A). In both groups oestrous behaviour was detected once a day. Ovulatory activity, 7 d after oestrus, fertility, prolificacy, embryo mortality, birth weight of lambs and milk production were recorded. The percentage of ewes which exhib...
متن کاملControl of gonadotrophin release in Scottish Blackface and Finnish Landrace ewes during seasonal anoestrus.
The patterns of LH and FSH secretion were measured in 4 experimental groups of Finnish Landrace and Scottish Blackface ewes: long-term (18 months) ovariectomized ewes (Group 1), long-term ovariectomized ewes with an oestradiol implant, which has been shown to produce peripheral levels of approximately 5 pg/ml (Group 2), long-term ovariectomized ewes with an oestradiol implant for 18 months whic...
متن کاملYear-round breeding of crossbred Dorset or Finnish landrace ewes using a synthetic light regimen.
A group of crossbred Dorset or Finnish Landrace ewes maintained under a synthetic light regimen (Light Treatment, 4 mo long days - 16 h light, 4 mo short days - 8 h light) and exposed to rams every 8 mo (January 1, September 1, May 1) was compared for lamb production over a period of 4.5 yr with two other comparable groups under natural daylight conditions, one exposed to rams once a year in th...
متن کاملComparison of hay and silage for pregnant and lactating Finnish Landrace ewes.
A comparison of conserving timothy/meadow fescue/meadow grass as silage or hay was conducted with Finnish Landrace ewes. Intake of hay (H), silage (S) and hay/silage (HS), and the performance of 30 Finnish Landrace ewes carrying twins, triplets and quadruplets and suckling either twin or triplet lambs was measured during the last 8 weeks of pregnancy and during the first 6 weeks of lactation. T...
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ژورنال
عنوان ژورنال: Canadian Journal of Animal Science
سال: 1974
ISSN: 0008-3984,1918-1825
DOI: 10.4141/cjas74-006