The utilization of Romanov sheep in a system of integrated husbandry

Cornu, Claude; Cognie, Y.

doi:10.1016/b978-0-407-00302-6.50040-4

Cited by 7 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the oestrus onset time was significantly different in G1 and G3 (P = 0.013), and this result was consistent with our previous studies (Kuru et al 2017(Kuru et al , 2020. In the non-breeding season, the oestrus rate was determined as 95.5% to 100% in Romanov ewes after 14-d FGA and 250 to 300 IU eCG treatment (Cornu and Cognié 1985), and 100% after 14-d FGA and 140 to 280 IU eCG treatment in Romanov x Pelibuey ewes (Macías-Cruz et al 2013). After 6-, 9-, or 12-d MAP + 300 IU eCG treatment, the oestrus rate in Santa Inês ewes was 72.7%, 72.7%, and 80%, respectively (Texeira et al 2016).…”

Section: Discussionsupporting

confidence: 90%

“…The conception rate was 89.5% and 90.7% in Romanov ewes after 14-d FGA and 300-350 IU eCG treatment, respectively during the non-breeding season. The conception rate was 90.9% after 14-d FGA and eCG treatment in Romanov ewes with a 90-d birth-mating interval (Cornu and Cognié 1985). In this study, the conception rate in G1, G2, and G3 was 79.2%, 72.0%, and 78.3%, respectively, and the short-term protocol had an effect similar to 9-d or 11-d progesterone treatments.…”

Section: Discussionsupporting

confidence: 52%

“…In different studies, the lambing rate was 83% (14-d FGA without eCG) (Ortiz 1988), 80.7% to 82.6% (14-d FGA and 300 to 350 IU eCG), and 86.4% (14-d FGA and 400 to 450 IU eCG) (Cornu and Cognié 1985) in Romanov ewes. The lambing rate was 65% after 12-d FGA and 140 to 280 IU eCG treatment during the non-breeding season in Romanov x Pelibuey ewes (Macías-Cruz et al 2013).…”

Section: Discussionmentioning

confidence: 97%

“…While eCG is typically used in protocols during the non-breeding season, the classic dose of eCG may be reduced due to multifollicle growth in this breed. Oestrus synchronization positively affects fertility and litter size during the non-breeding season (April-May) and the eCG dose should not exceed 300-350 IU (Cornu and Cognié 1985).…”

mentioning

confidence: 99%

See 3 more Smart Citations

Effect of oestrus synchronization with different lengths of progesterone-impregnated sponges and equine chorionic gonadotropin on reproductive efficiency in Romanov ewes during the non-breeding season

Kuru

Kaçar

et al. 2022

Acta Vet. Brno

View full text Add to dashboard Cite

This study aimed to determine the effects of different lengths of progesterone and equine chorionic gonadotropin (eCG) treatment on reproductive performance during the non-breeding season in ewes. Progesterone-impregnated sponges were inserted intravaginally for 7 d in Group 1 (G1, n = 24), 9 d in Group 2 (G2, n = 25), and 11 d in Group 3 (G3, n = 24). On the day of sponge removal, eCG (350 IU) was injected and 24 h later the ewes were exposed to rams. Pregnancy was diagnosed by transrectal ultrasonography 30 ± 3 d after mating. Oestrus symptoms of G2 and G3 started earlier than G1, but there was only a significant difference between G1 and G3 (P = 0.013). In G1, G2, and G3, the oestrus responses were 100%, 100%, and 95.8%, pregnancy rates were 79.2%, 72%, and 75%, lambing rates were 79.8%, 72%, and 75%, litter sizes were 2.5, 2.2, and 2.4, and multiple birth rates were 86.7%, 80%, and 85.7%, respectively (P > 0.05). In conclusion, the short-term progesterone-impregnated sponge and eCG treatment provided excellent oestrus induction. The effects of different days (7, 9, or 11) of progesterone treatment on reproductive indicators were similar; therefore, the stress caused by the inserted sponge can be reduced by short-term use.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 52%

Section: Discussionmentioning

confidence: 97%

mentioning

confidence: 99%

See 2 more Smart Citations

Effect of oestrus synchronization with different lengths of progesterone-impregnated sponges and equine chorionic gonadotropin on reproductive efficiency in Romanov ewes during the non-breeding season

Kuru

Kaçar

et al. 2022

Acta Vet. Brno

View full text Add to dashboard Cite

show abstract

“…Variation in age at puberty may be attributed to genetic differences such as breed and crossbreeding, whereas inbreeding tends to delay and crossbreeding tends to accelerate the onset of puberty (Hunter, 1982). Romanov ewe lambs reach puberty earlier than lambs of most other European breeds (Cornu and Cognie, 1985). Our results show that puberty occurred around three weeks earlier in RA than in CA ewe lambs.…”

Section: Puberty In Ewe Lambssupporting

confidence: 61%

Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Kridli

Abdullah

Shaker

et al. 2006

Italian Journal of Animal Science

View full text Add to dashboard Cite

The aim of this experiment was to determine the age at puberty of both ram and ewe lambs of three genotypes: Awassi (A), Charollais x Awassi (CA), and Romanov x Awassi (RA) F 1 crosses. Twenty, six-month old lambs (10 from each sex) from each genotype were used. Ram and ewe lambs were kept in separate groups from the beginning until the end of the experiment. Birth weight and weaning weight were recorded for all animals. Body weights and body condition scores were recorded at monthly intervals between 6.5 and 12 months of age. Blood samples were collected weekly from ewe lambs and fortnightly from ram lambs to monitor progesterone and testosterone profiles, respectively. Semen characteristics and scrotal circumferences (SC) were evaluated fortnightly. Weight at puberty in ewe and ram lambs were not significantly different among the three genotypes and ranged around 35 kg and 42 kg, respectively. In ewe lambs, age at puberty was significantly higher (P< 0.01) in A (280±11.5 d) than in RA (232±11 d) and CA (255±11.5 d). Age at puberty of ram lambs was also significantly different (P < 0.01) among the three genotypes being higher in A (243±5 d) than in CA (223±5 d) and RA (226±5 d) ram lambs. Semen parameters improved with age in all genotypes. The RA ram lambs had greater semen concentration and lower abnormal spermatozoa than the other two genotypes (P< 0.05). Results of the present study indicate that crossing Awassi ewes with either Charollais or Romanov sires tends to improve reproductive characteristics of the F 1 crossbreds through advancing age at puberty in both ram and ewe lambs. (255 ± 11,5 d). Anche nei maschi l'età alla pubertà è risultata significativamente diversa (P < 0,01) tra i

show abstract

Increasing prolificacy of ewes by means of gonadotrophin therapy and treatment with Fecundin

Scaramuzzi¹,

Campbell²,

Cognie³

et al. 1987

New Techniques in Sheep Production

View full text Add to dashboard Cite

The utilization of Romanov sheep in a system of integrated husbandry

Cited by 7 publications

References 6 publications

Effect of oestrus synchronization with different lengths of progesterone-impregnated sponges and equine chorionic gonadotropin on reproductive efficiency in Romanov ewes during the non-breeding season

Effect of oestrus synchronization with different lengths of progesterone-impregnated sponges and equine chorionic gonadotropin on reproductive efficiency in Romanov ewes during the non-breeding season

Age at Puberty and Some Biological Parameters of Awassi and its First Crosses with Charollais and Romanov Rams

Increasing prolificacy of ewes by means of gonadotrophin therapy and treatment with Fecundin

Contact Info

Product

Resources

About