Desempenho de cordeiros machos inteiros, machos castrados e fêmeas, alimentados em confinamento

Carvalho, Sérgio; Pires, Cléber Cassol; Peres, João Ronaldo Ramos; Zeppenfeld, Carla C.; Weiss, Alexandre

doi:10.1590/s0103-84781999000100023

Cited by 30 publications

(31 citation statements)

References 6 publications

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“…However, this gain was similar to that observed by Carvalho et al (1999), for ¾ Texel lambs (0.316 kg/day) and lower than that reported DM -dry matter; n: number of animals; R 2 -coefficient of determination; CV -coefficient of variation; ADMP -average daily milk production. by Ortiz et al (2005), who worked with increasing levels of creep feeding and reported average gains of 410 g/day.…”

Section: Resultssupporting

confidence: 84%

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

et al. 2012

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-The objective of this study was to evaluate the influence of feeding energy levels during the last third of gestation and lactation on performance of ewes and lambs up to weaning. The experiment was carried out in the sheep raising sector of Universidade Estadual de Londrina (UEL), from August to December of 2007. Thirty-two adult lambs with 105 days of gestation, average live weight of 57.55 kg and average body condition scores of 3.42 were used in the beginning of the experiment. The animals were confined in collective pens, distributed randomly in three treatments: 2.4; 2.2 and 2.0 Mcal of metabolizable energy (ME)/kg of dry matter (DM). Feed supply was ad libitum during the last third of gestation and lactation.Weaning occurred at 70 days. Body weight, body condition score and milk production of ewes and body weight of the lambs were analyzed. There were no significant differences for body weight and body condition of ewes at lambing; however, the level of 2.4 Mcal enabled better results for those characteristics at weaning and higher gain in weight and body condition scoring during the experiment. Severe energetic restriction (2.0 Mcal ME/kg DM) determined lower average daily milk production.Lambs from levels 2.4 and 2.2 presented similar weights in all measurements and were superior to those in level 2.0. Lambs from level 2.4 presented higher average weight gain from birth to weaning. The energetic restriction upon lambs at the end of gestation and during lactation limits the performance of ewes and lambs up to weaning.

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Section: Resultssupporting

confidence: 84%

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

et al. 2012

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“…Em relação ao sexo, Carvalho et al (1999) não observaram diferença para o ganho médio diário de cordeiras e cordeiros não castrados e castrados (0,309 kg dia -1 ) aos 50 dias de idade, resultado semelhante ao deste estudo, porém com valores superiores.…”

Section: Resultsunclassified

“…Neste contexto, Carvalho et al, (1999) relataram que o sexo é um dos fatores determinantes no desempenho dos animais.…”

Section: Introductionunclassified

“…Ocorre maior crescimento, com mais eficiência e menor percentagem de gordura, em machos não castrados em relação às fêmeas (Sents et al, 1982;Carvalho et al, 1999).…”

Section: Introductionunclassified

“…Conforme Carvalho et al (1999), as fêmeas podem ser utilizadas com eficiência para produção de carne ovina, apesar de haver evidência da superioridade de machos não castrados em relação a machos castrados e fêmeas, quando abatidos em idade muito jovem. As fêmeas depositam mais gordura na carcaça, levando-se em consideração idade e pesos similares aos dos machos (Cañeque et al, 1989) (Embrapa, 1999).…”

Section: Introductionunclassified

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Influência do tipo de parto e do sexo no desempenho e nas características da carcaça de cordeiros cruza Ile de France x Texel

et al. 2011

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Effect of birth type and sex on performance and carcass characteristics of Ile de France x Texel crossbred lambsThe effect of birth type and sex on performance and carcass characteristics of Ile de France x Texel crossbred lambs was evaluated in an experiment conducted at the Department of Animal Science, Federal University of Santa Maria (UFSM). Twelve non-castrated lambs and six ewe lambs were used in the study. The experiment was arranged in a completely randomized design, with six repetitions. The treatments were: entire lambs born as single, entire lambs born as twin and ewe lambs born as twin. The average daily weight gain from birth to 21 days of single lambs was higher (P <0.05) than lambs and ewe lambs born as twin. However, after the initial lactation period, when milk is no longer the main component of the diet, it was found that single lambs showed similar performance to that born as twin. Entire lambs had higher weight gain (P <0.05) than ewe lambs after 42 days of age. Carcass characteristics of single lambs and lambs and ewe lambs born as twin were similar, except for hot and cold carcass weights, carcass internal length and leg length, for which males were superior to females.

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Dietary nutrient restrictions in the post-weaning period change feed efficiency and productivity of Santa Inês ewe lambs

et al. 2020

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Context Interest in sheep production has grown considerably, mainly in the meat market segment in large urban centres. This growth is due to improved efficiencyand quality products, which makes the segment attractive for production. Aims Our objective was to evaluate the effects of dietary nutrient restrictions on the feed efficiency and productivity of Santa Inês ewe lambs. Methods Twenty Santa Inês ewe lambs were weaned at an average weight of 15.09 ± 2.63 kg and were randomly assigned in a 2 × 2 factorial design to nutritional plans for carcass finishing (early and late maturity) and levels of nutrient restriction (0% and 15% reduction of both crude protein (CP) and total digestible nutrients (TDN) relative to requirements) with five replications per treatment. The trial was divided into two phases: lambs aged 4–8 months (<8 months) and lambs >8 months old. Key results There were no differences (P > 0.05) between diets for average daily gain (ADG), dry matter intake (DMI), feed efficiency and residual feed intake. Ratios of ADG:DMI (% of liveweight (LW) and LW0.75) were affected (P ≤ 0.05) by restriction in ewe lambs >8 months old. Restriction model tests (ω1, ω2, ω3 and ω4) did not differ (P > 0.05) from complete models for diets formulated for early maturity; therefore, a single standard growth curve fitted this nutritional plan. On the other hand, the restriction model responses for diets formulated to late maturity differed (P ≤ 0.05) from the complete model, generating different standard growth curves according to the applied restriction. Feeding Santa Inês ewe lambs a restricted diet (by 15% CP and TDN) in an early-maturity nutritional plan will allow lambs to reach slaughter LW earlier than those fed unrestricted diets. Conclusions and implications When the objective is to terminate animals at a later age (>8 months), unrestricted diet formulated to a late-maturity nutritional plan will produce higher LW and subsequent reproductive efficiency. By contrast, reducing CP and TDN by 15% for ewe lambs >8 months of age may reduce growth rates at an initial phase.

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Desempenho de cordeiros machos inteiros, machos castrados e fêmeas, alimentados em confinamento

Cited by 30 publications

References 6 publications

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

Influence of pre and postnatal energy restriction on the productive performance of ewes and lambs

Influência do tipo de parto e do sexo no desempenho e nas características da carcaça de cordeiros cruza Ile de France x Texel

Dietary nutrient restrictions in the post-weaning period change feed efficiency and productivity of Santa Inês ewe lambs

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