Genetic basis of variation in reproductive performance. (2) Genetic correlation between gestation length and prolificacy in sheep

Shrestha, J. N. B.; Heaney, D. P.

doi:10.1016/0378-4320(90)90044-g

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…A negative correlation between sire breed and gestation length has been seen in the present study, indicating that a higher percent of the Rideau Arcott genotype is associated with a shorter gestation period. This is in complete agreement with a previous study by Shrestha and Heaney (1990), which showed that the more prolific Rideau Arcott and Finnish Landrace breeds had a shorter gestation length compared to less prolific genotypes such as Suffolk. A moderate paternal heritability has been found for gestation length in half siblings, indicating a genetic influence from the sire (Shrestha and Heaney, 2003).…”

Section: Discussionsupporting

confidence: 94%

Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Sir

Bartlewski

2010

Livestock Science

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Section: Discussionsupporting

confidence: 94%

Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Sir

Bartlewski

2010

Livestock Science

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“…According to Christenson et al (1976), Finnish Landrace ewes lambing at 1 year of age require close management during and after lambing, or lamb losses may be excessive. The length of gestation averaged 143.7 (SD 1.68) days, being shorter than reported by Shrestha and Heaney (1990) in twinbearing Finnish Landrace ewes (144.3 days).…”

Section: Mating and Lambing Performancementioning

confidence: 55%

Feeding levels during the growing phase affect the production of primiparous Finnish Landrace ewes

Sormunen-Cristian¹,

Jauhiainen²

2000

AFSci

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The effect of different feeding levels on the performance of primiparous ewes was studied in 31 Finnish Landrace ewes bred to lamb at the age of one year. Ewe lambs, initially weighing on average 19.2 kg (SEM 0.63), were placed on a low (L), standard (S) or high (H) level of feeding from 2 months of age to the end of mating and from 2 months pre-partum to the end of 8-week lactation. Changes in live weight were affected by the diet. During rearing, the ewe lambs on L diet gained significantly less (18.0 vs. 24.1 kg/lamb, P

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“…Foetal adipose tissue development is known to be very sensitive to foetal nutrition in late gestation (Shrestha and Heaney, 1990;Budge et al, 2003). Triplet lambs have experienced some degree of under nutrition in utero (Kaulfuss et al, 2000).…”

Section: Resultsmentioning

confidence: 99%

Neonatal lamb behaviour and thermoregulation with special reference to thyroid hormones and phosphorous element: Effect of birth weight and litter size

Darwish

El-Bahr

2008

Journal of Veterinary Medical Research

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New-born lambs have limited energy reserves and need a rapid access to colostrum to maintain homeothermy and survive. The object of this study was to investigate the importance of neonatal lamb behaviour in the maintenance of its body temperature and survival. The time taken to stand and suck after birth and rectal temperatures were determined in 72 crossbred lambs (progeny of crossing 1/2 Rhamani and 1/2 Finnish). In addition, blood samples were collected at 1, 24 and 72 h after birth. The obtained sera were assayed for thyroid hormones (T 3 and T 4 ), known to be involved in heat production and phosphorous element (ph) which is essential for energy metabolism. The obtained results revealed that, low birth weight and triplet lambs were behaviourally less active at birth and had less T 3 , T 4 , Ph and body temperatures values over the first 3 days of life than lambs of heavy or medium birth weight and single or twin lambs. Thus, light weight and triplet lambs were highly susceptible to hypothermia and were exposed to high rate of mortality (18.75 and 16.66%) during the neonatal period than other lambs (3.84, 10.00, 4.55, and 9.38 %, respectively). Therefore, the present study concludes that neonatal lamb behaviour, specifically success in standing and obtaining colostrum are extremely important for thermoregulation and survival of the neonate.

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Genetic basis of variation in reproductive performance. (2) Genetic correlation between gestation length and prolificacy in sheep

Cited by 10 publications

References 19 publications

Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Analyses of parental and seasonal influences on the synchrony of dexamethasone-induced lambing and lamb characteristics

Feeding levels during the growing phase affect the production of primiparous Finnish Landrace ewes

Neonatal lamb behaviour and thermoregulation with special reference to thyroid hormones and phosphorous element: Effect of birth weight and litter size

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