Effect of dietary protein to energy ratio on growth performance of pre-and post-weaned lambs

Herath, Hitihamy M. G. P.; Pain, S. J.; Kenyon, P. R.; Blair, Hugh T.; Morel, P. C. H.

doi:10.1016/j.anifeedsci.2020.114787

Cited by 4 publications

(4 citation statements)

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“…However, the higher CP:ME intake of LFP42 lambs during first two weeks did not result in improved growth rate compared to HFP57 and HFP42 lambs. This suggests that lambs may require a higher CP:ME intake for a longer period (63 and 57 days, for [ 5 ] and [ 6 ] studies, respectively) to have a notable growth difference. Alternatively, the commercial milk replacer (CP:ME ratio 12.2 MJ ME/kg) used in this study provided an adequate CP:ME for lamb growth, resulting in the lack of difference.…”

Section: Discussionmentioning

confidence: 99%

“…The selected lambs (mean live weight (LW) 4.93 ± 0.22 kg) were moved in-doors, individually penned and randomly allocated to one of three rearing treatments ( Table 1 ); (i) HFP57 ( n = 9): commercial milk replacer, high fibre concentrate pellets to 57 days of age; (ii) HFP42 ( n = 9): commercial milk replacer, high fibre concentrate pellets and early weaning from the milk replacer at 42 days of age; (iii) LFP42 ( n = 9): high protein milk replacer from 2–16 days of age followed by commercial milk replacer, low fibre pellets and early weaning from milk replacer at 42 days of age. All lambs were fed milk replacer at 2.1 times their maintenance energy requirement based on their LW as per previous studies by our group [ 5 , 6 ]. The maintenance requirement was calculated as ME m = 0.40 MJ/kgLW 0.75 d −1 [ 18 ].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, lambs fed commercial milk replacers could not compensate for the imbalance of CP:ME during their first two weeks of age through solid feed, as little or no intake occurs and the rumen is not yet sufficiently developed. However, pellet intake has been reported to reach considerable levels (approximately 200 g/d/lamb) by 30–40 days of age in lambs fed a diet of milk replacer and pellets [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Growth and Body Composition of Artificially-Reared Lambs Exposed to Three Different Rearing Regimens

Herath

Pain

Kenyon

et al. 2021

Animals

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This study was designed to investigate the influence of pellet fibre level, milk replacer composition and age at weaning on growth and body composition of lambs reared artificially. Romney ram lambs were randomly allocated to one of three rearing treatments; HFP57: commercial milk replacer to 57 days of age, and high fibre concentrate pellets; HFP42: commercial milk replacer with early weaning at 42 days of age, and high fibre concentrate pellets; LFP42: high protein milk replacer from 2–16 days of age followed by commercial milk replacer with early weaning at 42 days of age, and low fibre concentrate pellets. Lambs were slaughtered at 57 days of age. Overall average daily liveweight gain of lambs did not differ (p > 0.05) between treatments. Dressing out percentage, carcass weight, empty small intestine and omental fat were higher (p < 0.05) in HFP57 than in both HFP42 and LFP42 lambs. HFP42 and LFP42 lambs had heavier (p < 0.05) empty rumen weights. Whole body protein content was higher (p < 0.05) in HFP42 lambs compared to both HFP57 and LFP42 lambs. Fat content and daily fat deposition were greater (p < 0.05) in HFP57 lambs than HFP42 and LFP42 lambs. Weaning lambs at 42 days of age with provision of either low or high fibre concentrate pellets, resulted in similar growth rates, reduced whole body fat deposition and was a more cost-effective rearing regimen.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth and Body Composition of Artificially-Reared Lambs Exposed to Three Different Rearing Regimens

Herath

Pain

Kenyon

et al. 2021

Animals

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“…Rios -Rincon et al (2014) stated that bone growth occurs in line with age. Brito et al (2017) and Herath et al (2021) stated that high growth rate caused the slaughter weight can be achieved sooner. Moloney and McGee (2017) also stated that bone growth will continue until the growth plates close at post-puberty where skeletal size in mature sheep is reached.…”

Section: Productivitymentioning

confidence: 99%

Effect of feeding level on growth rate, carcass characteristics and meat quality of thin tailed lambs

Luthfi¹,

Adiwinarti

Purnomoadi

et al. 2022

J. Indonesian Trop. Anim. Agric.

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A study was conducted to investigate the growth rate and carcass characteristics of lambs under different feeding levels. Twenty one lambs (3 months old) were allocated into 3 treatments of feeding levels, namely 4% of body weight (BW) (T1), 5.5% of BW (T2) and provided ad libitum (T3). The diet contained 13.74% of CP and 61.79% of TDN. The lambs were raised to reach 25 kg BW, before being slaughtered. The parameters observed were dry matter intake (DMI), dry matter digestibility (DMD), body weight gain (BWG), feed conversion ratio (FCR), carcass production, meat-bone ratio (MBR), fat distribution, chemical composition of meat and fatty acids profile. The data obtained were analyzed by analysis of variance and continued by Duncan's multi-range test if there was any significant difference among the treatments. The results showed that the average of DMD was 59.71% (P>0.05). The lambs fed T3 had the highest BWG (203 g/day), the lowest FCR (6.8) and the shortest rearing time (67 days) (P<0.01). The average of carcass percentage was 46.36% and meat production was 6,931 g (P>0.05). The lambs of T3 had the heaviest carcass fat (2,698 g), the lightest carcass bone (1,985 g), the highest MBR (3.6), and the highest PUFA to SFA ratio (0.55). It can be concluded that the higher the feeding level resulted in the higher growth rate, the lower feed conversion ratio, higher meat-bone ratio and higher carcass fat production, lower feed conversion ratio and the shorter rearing time; but did not af-fect the meat quality.

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Validation of a mechanistic dynamic pre-weaned lamb growth and body composition simulation model

Herath

Pain²,

Kenyon³

et al. 2022

Animal Feed Science and Technology

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Effect of dietary protein to energy ratio on growth performance of pre-and post-weaned lambs

Cited by 4 publications

References 20 publications

Growth and Body Composition of Artificially-Reared Lambs Exposed to Three Different Rearing Regimens

Growth and Body Composition of Artificially-Reared Lambs Exposed to Three Different Rearing Regimens

Effect of feeding level on growth rate, carcass characteristics and meat quality of thin tailed lambs

Validation of a mechanistic dynamic pre-weaned lamb growth and body composition simulation model

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