Influence du niveau des apports énergétiques distribués à la brebis pendant la gestation sur le poids à la naissance et la croissance des agneaux

Tissier, Michel; Thériez, M.

doi:10.1051/rnd:19790211

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…It has been shown that birth weights of twin lambs are higher during spring lambing than during autumn lambing, even if pregnant ewes received a large quantity of food (Tissier and Theriez 1979). However, Bosc et af.…”

Section: Distal Part: End Oj Gestation and Lactationmentioning

confidence: 99%

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Ortavant¹,

Bocquier²,

Pelletier³

et al. 1988

Aust. Jnl. Of Bio. Sci.

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Seasonality of the reproductive cycle in sheep is a general phenomenon for mid-latitude breeds. The proximal part (breeding season) and also partially distal part (end of gestation and beginning of lactation) of this cycle is controlled by photoperiod, whatever the form of light regimens. Data are presented which indicate that male and female do not necessarily have the same photoperiodic sensitivity. Gonadal stimulation in the ram starts 1'5-2 months earlier than in the ewe under annual variations. Photoperiod controls the reproductive cycle by the intermediary of the hypothalamo-pituitary axis. There are both a steroidindependent and a steroid-dependent effect of light, depending on both decreasing and increasing daylength in mid-latitudes.

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Section: Distal Part: End Oj Gestation and Lactationmentioning

confidence: 99%

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Ortavant¹,

Bocquier²,

Pelletier³

et al. 1988

Aust. Jnl. Of Bio. Sci.

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“…Apparent digestibility of the diets was significantly higher (P < 0.05) after tricaprylin substitution for part of the tallow. The extent of the effect increased with the level of tricaprylin (P < 0.025 (Alexander, 1974;Robinson et aL, 1977;Tissier & Theriez, 1978) (Walker & Faichney, 1964;Glimp, 1972), but medium chain triglycerides (MC! are more easily disposed of in the digestive tract of domestic newborn mammals, being readily hydrolysed in the stomach under the action of salivary lipases and partially absorbed in this organ (Leat & Harrison, 1975;Perret, 1980) and completely hydrolysed and absorbed in the intestine (Walker & Stokes, 1970;Gibney & Walker, 1977).…”

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Effects of substitution of tricaprylin or coconut oil for tallow in milk replacers offered to preruminant lambs

Aurousseau¹,

Vermorel²,

Thériez³

et al. 1989

Ann. Zootech.

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Summary — The effects of tricaprylin or coconut oil on the digestibility of milk-substitute constituents, nitrogen balance, growth-rate and feed efficiency before weaning have been studied in 2 successive trials using 12 male Charmois (trial 1) and 20 male Limousin and Romanov x Limousin preruminant lambs (trial 2).In trial 1, 3 different diets (C i , T,a, T,b) containing 230, 161 or 92 g tallow and 0, 69 or 138 g tricaprylin per kg dry matter (DM) were prepared. Digestibility of the milk-substitutes was studied in 2-and 3-week-old lambs, and growth-rate and feed efficiency were studied up to weaning.In trial 2, 3 other diets (C 2 , C0 2 and T 2 ) containing 249, 166 or 166 g tallow, 0, 83 or 0 g coconut oil, and 0, 0 or 93 g tricaprylin per kg DM, were prepared. They were used for digestibility and nitrogen balance determination in 3-and 6-week-old lambs. Growth rates and feed efficiency were obtained between 10 days and weaning. In trial 1, the level of intake was 14 and 29% higher in lambs fed T1 a and Ti b than in lambs fed Ci . Apparent digestibility of the diets was significantly higher (P < 0.05) after tricaprylin substitution for part of the tallow. The extent of the effect increased with the level of tricaprylin (P < 0.025 gain/kg DM intake, respectively with C i , T,a or T!b milk substitutes.In trial 2, tricaprylin intake did not have any effect; coconut oil led to a slight increase in nitrogen digestibility, but only in 6-week-old lambs (from 0.970 to 0.979; P < 0.05). Mean apparent respective digestibilities of energy and nitrogen were 0.967, 0.969 or 0.972 and 0.965, 0.971 or 0.967 respectively for C 2 , C0 2 or T 2 . Coconut oil diet led to a 13 or 19% (P < 0.01) higher nitrogen balance respectively in 3-or 6-week-old lambs; tricaprylin resulted in a slight increase of nitrogen balance in 3-week-old lambs (+ 11 %, P < 0.10). Growth

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The influence of perinatal undernutrition of twin-bearing ewes on milk yields and lamb performance and the effects of postnatal nutrition on live weight gain and carcass composition

Lawlor¹,

Hopkins²

1981

Br J Nutr

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1. Studies were conducted to measure the influence of perinatal undernutrition of twin-bearing ewes on ewe milk yields and lamb performance in early lactation. Comparative studies were conducted with lambs to measure the effects of postnatal nutrition on lamb performance and carcass composition. The major objective of this work was to determine the extent of the influence of postnatal nutritional deprivation of lambs.2. From 8 weeks prepartum to 4 weeks postpartum each of forty twin-bearing ewes was given daily 0.30 MJ of m/kg body-weight (W)076. Measurements were made of ewe body-weight changes, milk yields during the first 4 weeks of lactation, and of lamb performance.3. There were three postnatal experiments with lambs of 'light' and 'normal' birth weights, wcaned from the ewes at 72 h. One hundred and four lambs were used and they were individually reared on separate allowances of lamb milk-substitute for 8 weeks. They were subsequently given a lamb concentrate ration. In Expts 1 and 2 the lamb concentrate was fed ad lib. to 'slaughter' live weight. In Expt 3 the concentrate was restricted for 8 weeks post weaning and then fed ud lib. A carcass analysis (bone, muscle, fat content) was conducted on all lambs after slaughter. In the first experiment, half the lambs were slaughtered at 8 weeks of age on being weaned off the milk substitute, and a carcass analysis was carried out.4. The mean net body-weight loss per ewe from commencement of late pregnancy to 28 d post partum was 23.8 kg. The over-all mean daily milk yield was 843 g/d. The mean growth rate of the lambs was 97 g/d during the 4-week measurement of ewe milk yields.5. Live weight gain of lambs subjected to restricted milk-substitute allowance (125 g/dry matter (DM) per d) was low, irrespective of lamb birth weight. The average daily gain over the %week postnatal period was 865 g/d on restricted milk allowance compared with 244 g/d for those fed ad lib. Conversely, the food intake and growth rate of these lambs were almost identical during feeding on ad lib. concentrates. This clearly reflected a response to compensatory food intake which was independent of either birth weight or postnatal milk allowance. The average daily gain of lambs, before weaning, on the restricted milk allowance was very similar to that of the lambs being suckled by ewes subjected to perinatal undernutrition. The effects of postnatal undernutrition of lambs was particularly reflected in the time required to reach 'slaughter' live weight. The period of time vaned from 117 d for those on od lib. food intake to 169 d for lambs on restricted food intake.6. The major effect of postnatal undernutrition on carcass composition was evident in the lambs slaughtered at 8 weeks in Expt I. The percentage carcass fat was 4.7 for those on the low milk allowance. The carcass composition of all lambs at 'slaughter' live weight was similar. It would appear that lambs on a restricted milk intake before weaning deposited more fat during the subsequent period of compensatory food intake.7. It is ev...

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Influence du niveau des apports énergétiques distribués à la brebis pendant la gestation sur le poids à la naissance et la croissance des agneaux

Cited by 3 publications

References 2 publications

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Seasonality of Reproduction in Sheep and its Control by Photoperiod

Effects of substitution of tricaprylin or coconut oil for tallow in milk replacers offered to preruminant lambs

The influence of perinatal undernutrition of twin-bearing ewes on milk yields and lamb performance and the effects of postnatal nutrition on live weight gain and carcass composition

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