Ovarian and endocrine responses in tropical sheep treated with reduced doses of cloprostenol

The present study was carried out to evaluate the genetic polymorphism in Ovine MTNR1A of two tropical breeds ie., highly prolific NARI Suwarna sheep and Mandya sheep from southern peninsular region of India with respect to differential fertility. Fifty animals from each breed were randomly selected and subjected to RsaI-RFLP analysis of exon-2 of Ovine MTNR1A. The study revealed monomorphic patterns in all the animals for both the breeds. PCR amplicon of 824 bp fragments with four cut sites at 53 bp, 320 bp, 343 bp and 754 bp, resulted in 411 bp, 267 bp, 70 bp, 53 bp and 23 bp. Only presence of CC genotypes at rs406779174 SNP of Ovine MTNR1A in both the breeds supports non-seasonality in breeding of these animals and no association of SNP with increased fecundity of NARI Suwarna sheep over Mandya sheep.

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Observations on the reproductive activity of tropical sheep in relation to the photoperiod

The Journal of Agricultural Science ◽

10.1017/s0021859600067514 ◽

1966 ◽

Vol 67 (1) ◽

pp. 7-12 ◽

Cited By ~ 4

Author(s):

R. B. Symington ◽

J. Oliver

Keyword(s):

Sexual Activity ◽

Reproductive Activity ◽

Progressive Increase ◽

Oestrous Cycle ◽

Gestation Period ◽

Normal Length ◽

Study Duration ◽

Natural Photoperiod ◽

The Hours ◽

Tropical Sheep

A study has been made of the effect of a progressive increase in the hours of light each day on the sexual activity of German Merino, Persian Blackhead and indigenous ‘Native’ ewes.Incidence of oestrous tended to be greater in ewes subjected to extended daylight than in ewes subjected to the natural photoperiod. This was particularly true during the latter stages of the study. Duration of oestrus was unaffected by the extended daylight but varied temporarily in both groups of ewes. The effect of extended daylight on duration of the oestrous cycle and on the incidence of oestrous cycles of normal or abnormal duration was not marked and differed between breeds. Extension of daylight to 19 hr. each day apparently did not prevent reproduction since several light-treated ewes inadvertently conceived, gave birth to and reared a healthy lamb after a gestation period of normal length.

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Relative expression analysis ofIL-5andIL-6genes in tropical sheep breed Pelibuey infected withHaemonchus contortus

Parasite Immunology ◽

10.1111/pim.12211 ◽

2015 ◽

Vol 37 (9) ◽

pp. 446-452 ◽

Cited By ~ 3

Author(s):

Z. M. Estrada-Reyes ◽

A. G. López-Reyes ◽

A. Lagunas-Martínez ◽

G. Ramírez- Vargas ◽

S. Olazarán-Jenkins ◽

...

Keyword(s):

Expression Analysis ◽

Sheep Breed ◽

Relative Expression ◽

Tropical Sheep

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Post-partum intervals to oestrus and conception in Yankasa sheep

The Journal of Agricultural Science ◽

10.1017/s0021859600043239 ◽

1985 ◽

Vol 104 (1) ◽

pp. 253-255 ◽

Cited By ~ 8

Author(s):

O. A. Osinowo ◽

Grace A. Ekpe

Keyword(s):

Post Partum ◽

Factors Affecting ◽

Tropical Sheep

The potential for twice-yearly lambings by tropical sheep is well recognized (Brown, Cameron & Ngere, 1972; Goode, Linnerud & Tugman, 1980; Osinowo, 1982). In order for ewes to lamb every 6 months the rebreeding interval must be 33 days or less. Factors affecting rebreeding in post-partum ewes have been reviewed (Hunter, 1968a, b Van Niekerk, 1979).

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