Growth and development of sheep

Kirton, A. H.; Fourie, P. D.; Jury, K. E.

doi:10.1080/00288233.1972.10421249

Cited by 34 publications

(5 citation statements)

References 9 publications

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“…The growth coefficients for carcass, head, and omental fat in the Romney in the present experiment were similar to those reported for the Romney by Kirton et al ( 1972) . The observation that there are breed differences in the rate at which eye muscle area increases relative to carcass weight gain has not previously been reported.…”

Section: Discussionsupporting

confidence: 89%

Performance of sheep on New Zealand hill country

Kirton

Dalton

Ackerley

1974

New Zealand Journal of Agricultural Research

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The growth and composition of 5-, 10-, and 15-month-old Merino, Romney, Corriedale, Perendale, and Border Leicester x Romney wethers on steep New Zealand hill country were studied. The Merinos grew slower than the Romneys and Corriedales, and the Perendales and Border Leicester x Romneys were the fastest-growing breeds, both in terms of live weight and carcass weight. Some benefits to hill country farmers of changing to a faster-growing breed of sheep are discussed.Data are given on the growth of various components weighed at slaughter, and detailed results are presented on the composition of the carcasses. The Romney is shown to be leaner than the other breeds at the same carcass weight. Growth coefficients differed between breeds lor omental fat, carcass protein, and eye muscle area.Taste panel results on leg roasts showed that the panel members preferred the meat from yearling sheep to that from young lambs. 283

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Section: Discussionsupporting

confidence: 89%

Performance of sheep on New Zealand hill country

Kirton

Dalton

Ackerley

1974

New Zealand Journal of Agricultural Research

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“…The weight ratios of the rumen, reticulum, omasum, abomasum, small intestine and large intestine to total GIT averaged 29.3%, 5.70%, 4.99%, 6.33%, 35.7% and 18.0% respectively. These percentages are similar to the ranges reported by Kirton et al (1972) for ewes with SBWs, the value closest to EBW (Fourie et al, 1970), ranging from 20 to 40 kg (19.6-28.1%, 3.71-5.36%, 1.72-2.91%, 8.10-9.55%, 37.0-53.2% and 13.6-17.0% for rumen, reticulum, omasum, abomasum, small intestine and large intestine respectively). Our results are also similar to a study by Mcleod and Baldwin (2000) of the effect of the diet forage/concentrate ratio and intake on visceral organ growth of lambs (calculated as a percentage of EBW) in which ratios of 1.36-2.06%, 0.25-0.45%, 0.22-0.43%, 0.48-0.72%, 1.56-2.30% and 1.32-1.70% were observed for rumen, reticulum, omasum, abomasum, small intestine and large intestine respectively.…”

Section: Intake and Body Compositionsupporting

confidence: 91%

Energy requirements of early‐weaned Dorper cross‐bred female lambs

Deng

et al. 2016

Animal Physiology Nutrition

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The net and metabolizable energy (NE and ME) requirements of Dorper cross-bred female lambs with BWs of 20-35 kg were assessed in a comparative slaughter trial. Thirty-five Dorper × thin-tailed Han cross-bred female lambs weaned at ~50 days of age (20.3 ± 2.15 kg BW) were used. Seven randomly selected lambs were slaughtered at the start of the trial (baseline group). An intermediate group consisting of seven randomly selected lambs fed ad libitum was slaughtered when the lambs reached an average BW of 28.5 kg. The remaining 21 lambs were allotted randomly to three levels of dry matter intake: ad libitum or restricted to 70% or 40% of the ad libitum intake. All the lambs were slaughtered when the sheep fed ad libitum reached a BW of 35 kg. Total body energy, nitrogen, fat, ash and moisture content were determined. In a digestibility trial, an additional 15 Dorper × thin-tailed Han cross-bred female lambs (28.7 ± 1.75 kg BW) were housed in metabolism cages and used in a completely randomized design experiment to evaluate the ME value of the diet at the three feed intake levels. The maintenance requirements for NE and ME were 245.5 and 380.3 kJ/kg metabolic shrunk body weight (SBW ) respectively. The partial efficiency of energy use for maintenance was 0.645. The NE requirements for growth ranged from 1.18 to 5.18 MJ/d for the lambs gaining 100-350 g/d from 20 to 35 kg BW. Partial efficiency of ME for growth was 0.44. In conclusion, the current study suggests that the NE requirement for maintenance and growth of Dorper early-weaned cross-bred female lambs is lower than the current AFRC and NRC recommendations.

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“…Burrin et al (1992) reported that the level of feed intake affected visceral organ mass without changing the DNA mass of the organ due to changes in cellular hypertrophy rather than changes in cell numbers. Kirton et al (1972) reported that the live weight and nutritional status of animals could affect the production efficiency of carcass offal. This is while noting that the inclusion of PKC in the diet caused a certain degree of feed restriction thereby lowering the weight of the primary metabolic organs such as the liver, heart, and small and large intestines (dos Santos et al, 2017).…”

Section: Carcass Characteristicsmentioning

confidence: 99%

The Growth Efficiency and Carcass Characteristics of Dorper Sheep Treated by Corn Inclusion as Energy into Palm Kernel Cake Based-Diet.

Saeed

Sazili

Akit

et al. 2018

Trop. Anim. Sci. J.

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This study investigated the effect of energy as partial replacement of a diet based on palm kernel cake (PKC) on the growth performance, nutrient intake, digestibility, carcass quality, and economic cost of Dorper sheep. Twenty-seven Dorper rams (initial body weight 15 ± 0.59 kg) were kept in individual pens and divided randomly into dietary groups consisting of T1: basal diet + 0% corn (control), T2: basal diet + 5% corn, and T3: basal diet + 10% corn. Feed intake was recorded on a daily basis. On day 110, 4 lambs from each group were randomly chosen and transferred into metabolism crates to determine nutrient digestibility and completely randomized design was used. The results showed that high feed intake was in T3 while, the DM, CP, NDF, and ADF digestibility were decreased significantly with the increasing level of corn as an energy source. The carcass cuts were not affected by the dietary treatments. Significant differences were noted in the non-carcass parts (heart, lungs and trachea, defattted kidneys, liver, spleen, and kidney fat) with T3 having the highest value. The feeding cost was slightly increased when PKC was replaced by corn. In conclusion, inclusion of 10% corn as a source of energy in 65.3% PKC as fattening diets had effects on growth BW, ADG, and organs performance on Dorper lambs.

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Growth and development of sheep

Cited by 34 publications

References 9 publications

Performance of sheep on New Zealand hill country

Performance of sheep on New Zealand hill country

Energy requirements of early‐weaned Dorper cross‐bred female lambs

The Growth Efficiency and Carcass Characteristics of Dorper Sheep Treated by Corn Inclusion as Energy into Palm Kernel Cake Based-Diet.

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