A.M.Q. Lana

Qualidade de ovos de consumo submetidos a diferentes condições de armazenamento

The internal quality of 768 commercial white eggs from 40-week-old Hy-Line laying hens was evaluated after storage under different conditions. The eggs were submitted to treatments in a factorial scheme of 2x4x8, being two types of package (using plastic film or not), four periods of storage (zero, five, 10, and 15 days), and eight refrigerated storage times (zero, five, 10, 15, 20, 25, 30 and 35 days). The values of Haugh Unities (HU) and albumen pH were measured. The HU values significantly decreased (P<0.05) during storage mainly at room temperature. Wrapping the eggs packages with plastic film showed efficient in preserving their internal quality since it kept HU higher for a longer storage time. The pH values of the eggs increased during the storage time (P<0.05), independently of both storage temperature and packaging. It was concluded that temperature and time of storage of eggs influenced on the values of HU and wrapping the eggs packages with plastic film improved their internal quality.

Desempenho de bezerros alimentados com dietas líquidas à base de leite integral ou soro de leite

Quinze bezerros da raca Holandesa, desaleitados aos 30 dias de idade, foram utilizados para avaliar os efeitos da inclusao de fontes proteicas alternativas, em substituicao as proteinas do leite integral, na formulacao de sucedâneos do leite. Os animais foram divididos em tres grupos: o grupo controle (C) - recebeu leite em po integral reconstituido; o grupo sucedâneo SL (soro/leite) recebeu 41,6% da proteina bruta (PB) vinda do concentrado proteico de soro (CPS), 23,1% do soro de leite e 35,3% do leite em po integral; e o grupo sucedâneo S (soro) recebeu 68% da PB vinda do CPS e 32% do soro de leite. O consumo de concentrado, feno, sal mineral e agua foi mensurado diariamente, enquanto o ganho de peso foi avaliado semanalmente. Nao houve diferenca (P>0,05) para o consumo de concentrado, sal mineral e agua entre os grupos, nos periodos avaliados. O consumo de feno e o ganho de peso foram inferiores nos animais do grupo S (P<0,05). A substituicao de 100% do leite integral por CPS e soro de leite influenciou negativamente o desempenho.

Influência da forma física da ração e da linhagem sobre o desempenho e rendimento de cortes de frangos de corte

Avaliou-se o efeito da forma fisica da racao sobre o desempenho e o rendimento de cortes de duas linhagens de frangos de corte, Cobb e Ross. Foram utilizados 900 frangos machos, criados em galpao experimental, com idades entre um a 45 dias. Os tratamentos foram definidos pela linhagem e forma fisica da racao da seguinte forma: (T1) racao farelada a vontade, (T2) racao peletizada a vontade e (T3) racao peletizada controlada. Para avaliacao do desempenho, o delineamento experimental foi o inteiramente ao acaso, em arranjo fatorial 3 x 2 (tres dietas e duas linhagens) e cinco repeticoes, sendo cada repeticao composta de 30 aves. Para a avaliacao do rendimento de cortes da carcaca, o delineamento foi o mesmo, com excecao do numero de repeticoes, que foi de 30, sendo cada ave considerada como uma repeticao. A racao peletizada controlada reduziu o ganho de peso em relacao a peletizada a vontade em 4,7% e melhorou a viabilidade da linhagem Cobb em 10%. Independentemente da linhagem, maiores ganhos de peso foram obtidos quando as aves foram alimentadas com racao peletizada a vontade. A restricao alimentar favoreceu a conversao alimentar das aves em 2%. A linhagem nao influenciou os parâmetros de rendimento de cortes e porcentagens de orgaos digestivos avaliados. A peletizacao favorece o desempenho de frangos de corte.

Efeitos dos programas de luz sobre desempenho, rendimento de carcaça e resposta imunológica em frangos de corte

The effects of lighting programs 23L:1E (23L); increasing (INC); 16L: 8E (16L) and natural light (NAT) on performance, carcass yield and immune response of Cobb-500 male broiler were evaluated. Chicks were raised from one to 45-day-old and the treatments were defined according to the lighting programs. The experiment was designed in four treatments with six repetitions of 35 birds each. Broilers of the INC lighting program showed heavier weights (P 0.05). The viability of the NAT treatment broilers was higher than the broilers of the 23L (P 0.05). The 23L treatment broilers showed higher breast yield when compared to the other treatments (P 0.05).

Efeitos da umidade relativa do ar na incubadora e da idade da matriz leve sobre o rendimento da incubação

Avaliaram-se os efeitos da umidade relativa do ar na incubadora (URI) e da idade da matriz leve sobre o rendimento de incubacao, sobre o peso absoluto do coracao e do saco vitelino e sobre a relacao desses dois orgaos com o peso do pinto ao nascer. Foram utilizados 10.836 ovos de matrizes da linhagem Lohmann LSL, com 26, 41 e 56 semanas de idade, incubados com niveis de URI de 48, 56 e 64%. A perda de peso do ovo foi maior a medida que diminuiu a URI ou a medida que aumentou a idade da matriz. A maior taxa de eclosao foi obtida quando se utilizaram 56% de URI, e os ovos das matrizes mais velhas apresentaram eclodibilidade reduzida. A maior relacao saco vitelino/peso do pinto foi obtida quando os ovos foram incubados com URI de 48% e com ovos de matrizes com idade de 41 semanas. Os pintos de matrizes com 41 e 56 semanas de idade apresentaram os maiores pesos absolutos do coracao e os das matrizes com 56 semanas, a maior relacao peso coracao/peso pinto.

Evolução anual da qualidade do leite cru refrigerado processado em uma indústria de Minas Gerais

The present study aimed to analyze the annual evolution of cooled raw milk quality, through analytical analysis of the data base of individual bulk milk tanks analysis, monthly computed from April/2002 to December/2008 at a dairy industry in Minas Gerais. The mean volume of milk in compliance with IN51 for total bacterial count for year 2008 increased from 74.3% in 2002 to 85.8% in 2008. Considering IN51 for year 2011, these values would be 30.5% and 46.6%, respectively. The mean volume of milk in compliance with IN51 for somatic cells count reduced from 93.5% in 2002 to 90.1% in 2008. Considering the legal standard for the year of 2011, these values would be 64.9 and 60.5%, respectively. In relation to the solid composition of milk, the mean volume of milk in compliance with IN51 for fat, protein and solids nonfat were 95.2%, 98.2% and 89.6%, respectively. The season variations affected the quality of the bulk tank cooled raw milk from bulk tanks. The implantation of a payment system for the quality of milk to the producer revealed to be efficient in its objective to improve the quality indexes of raw milk.

Avaliação da incidência e fatores de risco da retenção de placenta em vacas mestiças leiteiras

The incidence rate, risk factors and impact of retained placenta on the reproductive and productive performance of crossbred dairy cows was evaluated. The frequency distribution of retained placenta and also a Poisson multivariate analysis were developed for the following variables: year, calving season, lactation order, body condition score, gestation length, type of delivery, number and sex of calves. First calf heifers and multiparous cows, with and without retained placenta, during the rainy and dry season, had their average results compared in the following items: days from calving to first service, number of semen doses per conception, milk production up to 305 days and lactation peak. The incidence rate of retained placenta was 12.8%. The risk factors were: rainy calving season, 2nd, 3rd and above 4th lactation orders, body scores below 3.5 and greater than 4.0, abortion, stillbirth, premature birth, assisted birth and multiple birth. An increase of 51.2 and 27.5 days in the average interval between calving and first service, and of 1.2 and 0.6 in the average number of semen doses was observed in multiparous cows with retained placenta, giving birth during the rainy and dry seasons, respectively (P<0.05).

Infestação de Tunga penetrans siphonaptera: Tungidae em cascos de vacas leiteiras F1 Holandês-Zebu

Tunga penetrans rate of infestation in hooves of confined F1 Holstein-Zebu cows during the dry season was recorded. First parturition cows showed an infestation rate of 90.5% in the thorax and 96.9 in the pelvic members, second parturition cows showed an infestation rate of 95.3% in the thorax and 100% in the pelvic members while third parturition cows showed rate of infestation of 100% for both members.

Seleção e classificação multivariada de modelos de crescimento não lineares para bovinos Nelore

This study aimed to evaluate cluster analysis in classifying and selecting non linear models to describe Nelore beef cattle growth based on different goodness of fit criteria tests. A total of 12 non linear models were evaluated based on the following criteria: the determination coefficient (R2), error mean square (QME), Akaike information criterion (AIC), Bayesian information criterion (BIC), mean quadratic error of prediction (MEP) and predicted determination coefficient (R2p). The Brody model showed the best adjustment for the data set.

Digestibilidad aparente de dietas con probióticos o fitasa para potros Mangalarga Marchador

espanolEl uso de aditivos se ha desarrollado mucho actualmente, con el fin de mejorar el aprovechamiento de la dieta. El presente trabajo se realizo con el objetivo de evaluar los efectos de la suplementacion con probioticos o fitasa sobre la digestibilidad aparente (DA) de los nutrientes en 24 potros (16 machos y 8 hembras) Mangalarga Marchador con 241,6 ± 23,2 dias de edad y 216,7 ± 27,8 kg de peso vivo (PV). El experimento tuvo duracion de 28 dias (23 para la adaptacion y cinco para la recogida de muestras de heces) y la dieta basal se compuso de pasto de Cynodon y pienso comercial (1,2 kg /100 kg PV), ademas de agua y sal mineralizada ad libitum. Los tratamientos fueron: dieta basal (T1); dieta basal + 5 g/dia de 109 UFC/g de levadura S. cerevisiae (T2); dieta basal + 2 g/dia de 108 UFC/g de bacterias B. bifidum, E. faecium, L. acidophilus, L. plantarum y 105 UFC/g de levadura S. cerevisiae (T3); y dieta basal + 1250 FTU (unidades de fitasa)/dia (T4). La estimacion del consumo se realizo utilizando el indicador externo LIPE® y la tecnica de digestibilidad in situ. El diseno estadistico fue enteramente al azar, en esquema factorial 4 x 2, y las medias fueron comparadas por el test t de Student (p EnglishAdditives have been used to improve quality diet and animal development. The objective was to assess the effects of probiotic or phytase supplementation on apparent digestibility of nutrients in 24 Mangalarga Marchador foals (16 males, 8 females), aged 241.6 ± 23.2 days (mean ± SD/SEM), and weighing 216.7 ± 27.8 kg. The study lasted 28 days, the first 23 for diet and handling adaptation, and the last five days for fecal collection. The basal diet consisted of Cynodon pasture and pelleted concentrate (1.2 kg/100 kg body weight), as well as water and mineral salt ad libitum. There were four treatments: basal diet (T1); basal diet + 5 g/day of 109 CFU/g of S. cerevisiae (T2); basal diet + 2 g/day of 108 CFU/g of bacteria B. bifidum, E. faecium, L. acidophilus, L. plantarum and 105 CFU/g of S. cerevisiae (T3); and basal diet + 1250 FTU/day of phytase (T4). The DM intake was estimated with an external marker (LIPE©) associated with cecal in situ digestibility of DM. All foals were randomized by replicate using a 4 x 2 factorial, and results were compared using Students t-test (p