Optimum dietary crude protein level for finishing Awassi lambs

Haddad, S.G.; Nasr, Raoul E.; Muwalla, M.M.

doi:10.1016/s0921-4488(00)00172-3

Cited by 47 publications

(46 citation statements)

References 12 publications

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“…Our results are globally in agreement with other studies (Titi et al, 2000). With much fewer treatments, Haddad et al (2001) observed in growing lambs that 16% CP was the optimum level to promote growth.…”

Section: Omdsupporting

confidence: 94%

Response of growing ruminants to diet in warm climates: a meta-analysis

Salah

Sauvant²,

Archimède

2015

Animal

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The aim of this work was to establish the response of growing sheep, goats and cattle to different nutritional environments. Data from 590 publications representing 2225 treatments were analysed. The results showed that each 10% increase in NDF was accompanied by 0.11 g/kg live weight (LW) and 0.32 g/kg metabolic live weight (LW 0.75 ) decreases in DMI. Otherwise, the response of DMI to CP (CP%DM) content was curvilinear (P < 0.01), without any significant difference in the slope between species. The percentage of concentrate (% CC) affected DMI curvilinearly, without any significant difference between species. This meta-analysis demonstrated the negative linear effect of NDF and the quadratic effect of CP concentration on organic matter digestibility (OMd). For growth performance, the three species responded curvilinearly to variations in metabolisable energy intake (MEI MJ/kg LW 0.75 ) and digestible CP (DCPI g/kg LW 0.75 ) intake (P < 0.01). At the same level of MEI, average daily gain (ADG) varied with CP contents of the diet, and only the intercept differences were significant between the three levels (P = 0.07). At the same level of DCPI, ADG varied with energy level (below maintenance (LE − − ), 1 to 1.2 × maintenance (LE − ), 1.2 to 1.4 × maintenance (ME + − ), and >1.4, corresponding to maximum growth (HE + )). No significant difference was observed between LE − − and LE − , and no significant difference was observed between ME + − and HE + . For nitrogen balance, no difference was observed between species for a given level of nitrogen intake.

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Section: Omdsupporting

confidence: 94%

Response of growing ruminants to diet in warm climates: a meta-analysis

Salah

Sauvant²,

Archimède

2015

Animal

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“…On the other hand, Haddad et al (2001) suggested an optimal content of 16% CP in diets for Awassi lambs. Beauchemin et al (1995), studying diets with 15 and 18% CP, in Finn and Romanov lambs, also did not observed defferences between treatments, and suggested that effects of diets on performance were more related to energy concentration than to protein source or content in the diet.…”

Section: Resultsmentioning

confidence: 99%

Performance of Santa Ines lambs fed diets of variable crude protein levels

Rocha¹,

Susin²,

Pires³

et al. 2004

Sci. agric. (Piracicaba, Braz.)

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Differences among dietary protein levels suggested in the literature point out to the need for better evaluation of protein requirements of growing lambs, raised in drylot on a high-concentrate diet. This study evaluates the influence of crude protein (CP) levels in high concentrate diets on performance and carcass traits of ram lambs, confined for 56 days. Forty eight (48) Santa Ines lambs (initial body weight 18.4 ± 0.4 kg; 86 ± 2 days old) were fed 4 experimental diets containing 14, 16, 18 or 20% CP, in a completely randomized block design. Diets consisted of 80% concentrate and 20% sugarcane bagasse. There were no differences in average daily gain: values of 228, 220, 230 and 231 g d -1 were obtained for diets containing 14, 16, 18 and 20% CP, respectively. There were no differences in dry matter intake and feed conversion: values were 1.03; 1.02; 1.08 and 1.10 kg d DESEMPENHO DE CORDEIROS SANTA INÊS EM DIETAS COM TEORES VARIÁVEIS DE PROTEÍNA BRUTARESUMO: A controvérsia sugerida na literatura aponta a necessidade de uma maior averiguação das necessidades protéicas de cordeiros (Ovis aries) em crescimento, terminados em confinamento e alimentados com dietas de alta proporção de concentrado. Este trabalho avaliou a influência de teores de proteína bruta (PB) em dietas com alta proporção de concentrado sobre o desempenho e características de carcaça de cordeiros deslanados, confinados por 56 dias. Foram utilizados 48 cordeiros da raça Santa Inês (peso inicial de 18,4 ± 0,4 kg; idade inicial de 86 ± 2 dias), sendo distribuídos 2 animais por baia, em um delineamento experimental em blocos casualizados com 4 tratamentos e 6 repetições. As dietas experimentais continham 80% de concentrado e 20% de bagaço de cana-de-açúcar, com teores de 14, 16, 18 ou 20% PB na matéria seca. Não houve diferença entre os tratamentos para ganho de peso, os quais foram 228, 220, 230 e 231 g d -1 para as dietas com 14, 16, 18 e 20% PB, respectivamente. Não houve diferença entre os tratamentos para consumo de matéria seca e conversão alimentar, cujos valores foram 1,03; 1,02; 1,08 e 1,10 kg d -1 e 4,19; 4,28; 4,35 e 4,44 kg MS kg -1 de ganho para as dietas com 14, 16, 18 e 20% PB, respectivamente. A concentração de N uréico plasmático aumentou linearmente para as dietas contendo teores crescentes de PB. Não houve diferença entre os tratamentos para as características de carcaça.

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“…Já em outro estudo, utilizando dietas com 78% de concentrado e concentrações protéicas entre 10 e 18% PB, verificou-se médias de coeficientes de digestibilidade para MS e MO de 70 e 74%, respectivamente (Haddad et al, 2001). …”

Section: Nitrogênio Uréico Plasmático (Nup)unclassified

“…O consumo e a digestibilidade aparente do N e PB foram maiores (P<0,05) para as dietas com 16, 18 e 20% PB em relação às dietas com 12 e 14% PB. Vários trabalhos têm verificado aumento na digestibilidade do N com o aumento do teor de N da dieta (Sultan & Loerch, 1992;Beauchmin et al, 1995;Lallo, 1996;Manso et al, 1998b;Haddad et al, 2001e Zundt et al, 2001c. Owens & Zinn (1988) verificaram que a regressão da digestibilidade de N contra a ingestão de N produz uma linha reta ao longo de uma grande variedade de dietas, de modo a concluir que a digestibilidade aparente de N varia com o teor de N da dieta.…”

Section: Nitrogênio Uréico Plasmático (Nup)unclassified

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Teores de proteína bruta em dietas com alta proporção de concentrado para cordeiros confinados.

Rocha¹

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Optimum dietary crude protein level for finishing Awassi lambs

Cited by 47 publications

References 12 publications

Response of growing ruminants to diet in warm climates: a meta-analysis

Response of growing ruminants to diet in warm climates: a meta-analysis

Performance of Santa Ines lambs fed diets of variable crude protein levels

Teores de proteína bruta em dietas com alta proporção de concentrado para cordeiros confinados.

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