Luiz Eduardo dos Santos

Características de carcaça de cordeiros Suffolk abatidos em diferentes idades

The effect of slaughter age on non-carcass components and carcass characteristics was evaluated in 35 Suffolk lambs slaughtered at average age of 90, 130 or 170 days, fed corn silage and concentrate (19.6% CP). As the slaughter age increased, animal live weight and carcass weight linearly increased, and some non-carcass components as blood, head, legs and full viscera percentage linearly decreased, leading to a linear increase in carcass yield. As the slaughter age increase, it was observed change in the proportion of carcass components with a linear increase of fat percentage, a linear decrease in bones percentage and no change in the muscle percentage. A linear decrease in the hindquarter, a linear increase in the ribs and no change in the forequarter carcass cuts was observed with increasing slaughter age. Higher slaughter age led to a linear increase in carcass measures and compactness. The slaughter age of Suffolk lambs, to produce suitable carcasses for retail, is between 110 and 130 days of age.

Desempenho e características de carcaça de cordeiros Suffolk alimentados com diferentes volumosos

Suffolk lambs, weaned at 60 days, were raised in slatted floor pens and fed corn silage, sorghum silage or Coast cross hay (Cynodon dactylon L. Pears) plus concentrate ration (3,5% of live weight) to evaluate their performance, proportion of non-carcass components and carcass dressing and traits. A completely randomized design in a factorial arrangement (tree roughage feed X two sexes) was used. Lambs fed corn silage or sorghum silage showed greater (P 0.05) between feeds, although, lambs fed corn silage showed greater (P 0.05) in proportion of muscle (60.0 and 60.7%). Sorghum silage can replace corn silage for feedlot lambs, but grass hay feeding worsens their performance.

Utilização de carneiros de raças de corte para obtenção de cordeiros precoces para abate em plantéis produtores de lã

RESUMO - Sessenta e nove cordeiros filhos de ovelhas das racas Ideal ou Corriedale cobertas com machos das racas Suffolk, Ile de France, ou da mesma raca materna, foram usados para avaliar o seu desempenho e as caracteristicas de carcaca. Os animais permaneceram em pastagem ate o desmame (60 dias), foram confinados por 90 dias e alimentados com racao a base de silagem de milho e concentrado. Foi usado delineamento completamente casualizado em esquema fatorial. O uso de machos de corte sobre femeas lanigeras nao causou efeito sobre o peso ao nascer e ao desmame das crias, porem aumentou o peso e a compacidade das carcacas, sem alterar as proporcoes de traseiro e costilhar. A espessura de gordura subcutânea nao foi influenciada pelo genotipo, apresentando-se maior para femeas. A area de olho de lombo nao apresentou diferenca entre genotipos. As medidas de carcaca mostraram diferenca entre genotipos, sendo as do cruzamento com Suffolk mais compridas, seguidas pelos mesticos de Ile de France.

Características do dossel forrageiro e acúmulo de forragem em pastagem irrigada de capim-aruana exclusivo ou sobre-semeado com uma mistura de espécies forrageiras de inverno

Three winter forage species: black oat (Avena strigosa Schreb. cv. Common), italian ryegrass (Lolium multiflorum Lam. cv. Common) and white clover (Trifolium repens L. cv. Zapican) were introduced in a pasture of aruanagrass (Panicum maximum Jacq. cv. Aruana), grazed by sheep in an intensive production system (irrigation, fertilization and rotational stocking) with the objective of increasing the forage supply during the dry winter period. From 04-14-00 to 01-18-01 and 06-07-01 to 02-22-02, in six grazing periods, the pre-grazing forage mass, botanical composition and leaf blades percentage were evaluated in the six regrowth periods, as well as forage accumulation (FA). A completely randomized block design with replication within blocks was used. The treatments were: 1) grass alone and 2) the grass oversown with the mixture of winter forages. The oversown pasture had a greater total forage mass than the control in the second period as well as in the overall mean of the six periods of first year. The black oat made higher contribution in the second period while italian ryegrass contribution was higher in the third period. Higher FA was observed in the oversown pasture compared to the pure aruanagrass pasture, in the second, fifth and in the mean of the six regrowth periods. Total forage mass did not differ between treatments in the second year. The black oat contribution was higher in the first period while that of italian ryegrass was higher in the third period. The FA was similar in the two pasture systems. Fertilized and irrigated aruanagrass pasture, oversown with winter annual forages, out-yielded pure aruanagrass pasture during the dry winter period.

Efeito do sistema de manejo sobre o comportamento em pastejo, desempenho ponderal e infestação parasitária em ovinos Suffolk

Grazing behaviour, ponderal growth and level of parasitic infestation were studied in Suffolk breed sheep, from 1994 to 1995, in Nova Odessa, Sao Paulo. Two management systems were compared: restricted grazing, where the animals were released to the pastures at 9:50 a.m. and confined at 5:30 p.m., and 24 hour grazing, where the animals were maintained all the time in the paddocks, but with access to shelters. Thirty-four adult ewes were used in the summer period (17 under restricted grazing and 17 full-time grazing), and 42 ewes in the winter period (21 with restricted grazing and 21 full-time grazing). Also, for both seasons, 12 tracer animals, six in each grazing system, were used to obtain worm counts from their digestive tracts. For three consecutive days, grazing behaviour, that is, whether grazing or not, was observed in January/February (summer) and July/August (winter) at 30 minute intervals from 7:00 a.m. to 5:30 p.m., also whether the animals stayed in the sun or shade, irrespective of whether they were grazing or not. The level of parasitic infestation was evaluated under each system by eggs per gram countings (EPG) of the herd and the tracer animals, as well as by larvae count. It was concluded that restriction of grazing time by itself does not provide any effective control of parasitic infestation in sheep, however a better control was obtained in the summer period. Restricted grazing time was compensated by the greater activity of the animals during the hotter hours of the day, however, this behaviour affected the animal performance, resulting in lower weight gains. Greater forage availability in relation to estimated consumption may explain the similarity between the grazing times observed in both management systems, either in the summer or in the winter.

Efeito de processos de pré e pós-abate sobre características da carne de ovelhas da raça Santa Inês, descartadas por idade

The effect of replacing shortening and sugar on the physical and chemical properties of mangaba ice cream and its acceptability were evaluated. Ice cream fo...

Effect of pre and post-slaughter processes on meat characteristics of Santa Ines ewes discarded due to age

The effect of replacing shortening and sugar on the physical and chemical properties of mangaba ice cream and its acceptability were evaluated. Ice cream fo...

Produção de cordeiros da raça Suffolk em dois sistemas de manejo reprodutivos

Thirty-two Suffolk ewes were utilized for two years in two different mating systems: a traditional (mating at every twelve months) and an alternative (at every eight months), aimed to reduce the seasonality of available animal to slaughter. The fertility and prolificity of ewes in the alternative system were 66.7 and 110.4% and in the traditional system 76.1 and 103.1%. It was obtained 53 and 33 lambs in the period. Lamb mortality were 28.3 and 6.1% (P 0.05) and parturition ewe weight were 66.06 and 71.05kg (P>0.05) for alternative and traditional system, respectively. Alternative mating system made possible to obtain larger number of lambs, without deleteriou effect to ewes and lambs performances, as well as a better distribution in the number of lamb for slaughter during the year.