A Comparison of the Effect of Stilbestrol on the Growth Response of Lambs of Different Age and Sex

Clegg, M. T.; Albaugh, Reuben; Lucas, J.M.S.; Weir, W. C.

doi:10.2527/jas1955.141178x

Cited by 13 publications

(4 citation statements)

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“…In Experiment 1, hexoestrol implantation resulted in a consistent although small increase in the rate of live-weight gain of ram, wether and ewe lambs, a result which agrees with most reports of trials with young sucking lambs (Jordan, 1953a and b;Averill, 1955;Clegg et al, 1955). Experiment 1 can be criticised on the grounds that there were too many treatments and owing to the lambing percentage being lower than expected this led to a shortage in the number of lambs available for the male groups.…”

Section: Endocrines Teats and Reproductive Organssupporting

confidence: 89%

The effect of hexoestrol on growth, carcass quality, endocrines and reproductive organs of ram, wether and female lambs

Preston¹,

Greenhalgh²,

MacLeod³

1960

Anim. Prod.

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1. Two experiments were made. In Experiment 1, 124 ram, wether and ewe lambs were allocated to four equal groups as they reached a live-weight of 30 lb. Group A received no hexoestrol; group B were implanted with a 15 mg. pellet of hexoestrol and lambs of group C were given a second pellet of 15 mg. 35 days after the first. Group D were implanted with three 5 mg. pellets simultaneously in three different sites. The lambs were creep-fed while running with their dams on pasture and were killed as they reached a live-weight of 95 lb.In Experiment 2, 20 weaned ram lambs were allocated to a hexoestrol-implant group or a control group as they reached a live-weight of 40 lb. They were fed a pelleted ration indoors and were slaughtered at a live-weight of 110 1b.2. Length of teats and weight of the pituitary were significantly increased for all lambs treated with hexoestrol as compared with their controls. Excessive mammary development and one case of rectal prolapse were observed i n treated ewe lambs, while 3 of the treated rams in Experiment 2 had scrotal oedema.3. The rate of live-weight gain was greater for all hexoestrol-implanted lambs in Experiment 1 but less for the implanted lambs on Experiment 2 as compared with their respective controls. The differences just failed to attain significance at the 5% level.4. Dressing percentage was significantly reduced by hexoestrol treatment i n Experiment 1. On the other hand treated ram lambs in Experiment 2 had significantly higher dressing percentages and appeared to be fatter than the controls.5. Weights of testes and seminal vesicles in the ram and of the ovary in the ewe were decreased by hexoestrol treatment. Weights of seminal vesicles in the wether and of oviducts and uterus in the ewe were increased.

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Section: Endocrines Teats and Reproductive Organssupporting

confidence: 89%

The effect of hexoestrol on growth, carcass quality, endocrines and reproductive organs of ram, wether and female lambs

Preston¹,

Greenhalgh²,

MacLeod³

1960

Anim. Prod.

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“…The significantly greater live-weight gains and slightly lower dressing out percentages of implanted as compared with control lambs are in agreement with the findings of the majority of workers in this field. Clegg et al (1955) (1953 a ) found that repeated implants throughout the trial period gave no additional response. I n our experiment, dissection of the ears of the implanted lambs at slaughter showed that, with the exception of two animals, the first pellet had been completely absorbed and a considerable portion of the second had also been used.…”

Section: Discussionmentioning

confidence: 99%

The effect of hexoestrol implantation on carcass composition and efficiency of food utilization in fattening lambs

Gee¹,

Preston²

1957

Br J Nutr

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The subcutaneous implantation of stilboestrol or hexoestrol has been shown to increase the daily rate of live-weight gain and efficiency of food utilization in lambs (Andrews, Beeson & Harper, 1949;Jordan, 1950 (1956) found that the carcasses from treated steers contained more muscle, more bone and less fat than carcasses from untreated animals. O'Mary et al. (1952) reported that, whereas the subcutaneous fat of treated lambs was thinner and contained more moisture, there were no significant differences in muscular development or in intermuscular fat. Whiting, Clark & Allen (1954) suggested that the increase in live weight of treated lambs might be due entirely to an increase in moisture content of the tissues and to a higher percentage of offal.These conclusions have been based on limited carcass measurements and analyses of small sample joints such as the cut incorporating the ninth, tenth and eleventh ribs in steers (Aitken & Crichton, 1956) and the eleventh rib in lambs (O'Mary et al. 1952). Since stilboestrol is known to alter the conformation of the animal (Acker, Whiteman, Gallup & Tillman, 1955) the composition of such sample joints is unlikely to be representative of the carcass as a whole. Moreover, the claims that stilboestrol treatment improves the efficiency of utilization of food are based only on live-weight increases per unit of food consumed and can have little significance until the composition of the extra live weight of treated animals is known.The object of the present experiment was to determine the composition of the weight gains of lambs implanted with hexoestrol and the relative efficiency with which the lambs converted protein and energy in the food to protein and fat in the carcass.Thirty-six Suffolk x Half-bred, 5-month-old, wether lambs were allocated at random to three groups. The first group, designated the ' sample-slaughter group', was killed at the beginning of the experiment. Each lamb of the second group had implanted subcutaneously in the left ear a 15 mg pellet of hexoestrol. The third group was a control. Implanted and control lambs were housed individually indoors and were given a daily ration of 100 g hay and increasing amounts of a mixture of 8 parts maize meal, z parts crushed oats, 2 parts bran, I part white-fish meal and I part linseed cake for an experimental period of about 90 days.After 50 days it was no longer possible to feel the pellet in the ears of the animals and a further implantation of a 15 mg pellet of hexoestrol was made.The lambs given hexoestrol and the controls were slaughtered at a similar stage of fatness as decided by two independent judges. One animal from the control group and one from the implanted group failed to adjust itself to indoor feeding conditions and the results for these two lambs have been excluded.Slaughter technique. Immediately after slaughter the warm carcass weight of each lamb was recorded together with the weights of the head, feet, skin and fleece, pluck (i.e. heart, lungs and liver), kidney and associated fat and the ali...

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“…Clegg et al (1955) who implanted lambs at live-weights varying from 20 to 60 lb. Clegg et al (1955) who implanted lambs at live-weights varying from 20 to 60 lb.…”

Section: Discussionmentioning

confidence: 99%

The effect of hexoestrol implants on sucking and weaned lambs fattened on farms in the north-east of Scotland

Preston¹,

Greenhalgh²,

MacLeod³

1959

Anim. Sci.

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1. 768 lambs on fourteen farms in the north-east of Scotland were divided into a control group and groups receiving two 5 mg., three 5 mg., two 7·5 mg., and one 15 mg. pellet of hexoestrol.2. On every farm the mean rate of live-weight gain of the treated lambs was greater than that of the controls.3. There appeared to be very little difference between implantations of two 5 mg., three 5 mg. and two 7·5 mg. pellets of hexoestrol but on four farms where a direct comparison was made one 15 mg. pellet was slightly inferior to three 5 mg. pellets.

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A Comparison of the Effect of Stilbestrol on the Growth Response of Lambs of Different Age and Sex

Cited by 13 publications

References 0 publications

The effect of hexoestrol on growth, carcass quality, endocrines and reproductive organs of ram, wether and female lambs

The effect of hexoestrol on growth, carcass quality, endocrines and reproductive organs of ram, wether and female lambs

The effect of hexoestrol implantation on carcass composition and efficiency of food utilization in fattening lambs

The effect of hexoestrol implants on sucking and weaned lambs fattened on farms in the north-east of Scotland

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