Renata Nayhara de Lima

Desenvolvimento dos estômagos de bezerros recebendo diferentes dietas líquidas

This research evaluated the influence of different liquid diets on development of the stomach compartments of crossbred calves. It was used 24 crossbred calves distributed in a completely randomized design with four treatments and six replications: whole milk, 50% whole milk + 50% of cheese whey, 50% whole milk + 50% cheese whey supplemented with a whole egg; whole milk and 50% + 50% of cheese whey a supplemented with a egg added with biotin. I was evaluated the dry matter intake, weight gain, absolute and relative weight (weight of the empty body and weight stomach full) of the four stomach compartments, and papillae height of four rumen regions. The experimental diets did not affect any of the traits, being shown a relationship between animal performance and development of gastric compartments. The development of calf stomachs was not affected by the tested liquid diets, therefore enabling the replacement of 50% of milk for cheese whey.

Parâmetros séricos de bezerros submetidos a diferentes tipos dietas líquidas

This study was conducted to evaluate the influence of the liquid diet on the blood metabolites profile related to the protein and energy status of calves receiving different liquid diets. Twenty-four calves of Holstein x Gir breed were distributed in a completely randomized design with four treatments and six replications: Whole milk (Control); 50% whole milk + 50% of whey of cheese in natura; 50% whole milk + 50% of cheese whey in natura + one egg in natura; 50% whole milk + 50% of cheese whey in natura + one egg in natura + of biotin. The adaptation of the animals to the experimental diets occurred ten days before the beginning of the treatments. The animals received concentrate, Tifton-85 (Cynodon sp.) hay and water ad libitum from the birth to wean. Samples of blood were weekly collected in the morning, before the supply of the liquid diet and two hours after the ingestion. The concentrations of glucose, urea, creatinin, total proteins and albumin found in the serum of the calves, between liquid diets tested, were within normal limits when compared to reference levels in the literature. Only the values of urea differ significantly between treatments, but without harming the performance of the animals, soon it can be used the cheese whey in substitution to the whole milk, in the proportion of 50%, without egg or biotin addition, for a redution on the production cost.

Aspectos físico-químicos e microbiológicos do queijo tipo coalho comercializado em estados do nordeste do Brasil

The objective of this study was to evaluate the physical-chemical and microbiological profile of the rennet cheese sold in six states in northeastern Brazil. Physical-chemical and microbiological analyses of 104 samples of rennet cheese sold in the states of Pernambuco, Piaui, Ceara, Rio Grande do Norte, Paraiba and Sergipe were analyzed, being 50 samples inspected and 54 without inspection. There was no significant difference (p > 0.05) for physical-chemical parameters between samples. In accordance with the parameters of the legislation, in the 104 examined samples of rennet cheese, it was observed that 100 (96.15%) were outside the limits for Staphylococcus coagulase positive; 32 samples (31%) did not follow the standardization required for coliforms; and only one sample showed the presence of Salmonella sp. There was no significant difference (p > 0.05) between samples with and without inspection for microbiological analyses. The similarity found in the assessment of physical- chemical parameters of rennet cheese between the evaluated states demonstrates uniformity in the processing of this product. High levels of contamination by pathogens such as Staphylococcus coagulase positive and thermo-tolerant coliforms, as well as the presence of Salmonella sp., demonstrate that the consumption of rennet cheese may present a health risk for consumers.

Características de carcaça e componentes de peso vivo de bezerros recebendo diferentes dietas líquidas

This research evaluated the influence of different liquid diets on carcass yield, and components of retail cuts weight of crossbred calves slaughtered at 60 days of age. It was used 24 crossbred calves distributed in a completely randomized design with four treatments and six replications: whole milk, 50% whole milk + 50% of cheese whey, 50% whole milk + 50% cheese whey supplemented with a whole egg; whole milk and 50% + 50% of cheese whey supplemented with a egg added with biotin. It was evaluated intake, weight gain and slaughter weight. After slaughter at 60 days, it was collected all data related to carcass characteristics, commercial cut yields and components of body weight. The data were analyzed using ANOVA and Tukey mean comparison (P<0.05). The substitution of milk by cheese whey in nature can be adopted as a way to reduce the cost of production in lactating since such a substitution will not adversely interfere with the development of animals.

Cutaneous evaporative thermolysis and hair coat surface temperature of calves evaluated with the aid of a gas analyzer and infrared thermography

Abstract The aim of this study was to assess the cutaneous evaporative thermolysis (CET) of different body regions of calves and its relationship to microclimate and coat surface temperature with the use of a gas analyzer and infrared thermography. Our study addresses two questions: (1) Is CET related to surface temperature and/or ambient temperature? (2) Is CET distributed heterogeneously over the body surface, as observed in adult animals? For the purposes of this study, we used twenty-three confined, crossbred calves (Holstein × Zebu). The microclimate was evaluated for air temperature, relative humidity, wind speed, and black globe temperature. Air temperature was analyzed as temperature classes ( 29 °C). CET was determined using a ventilated capsule coupled to a CO 2 /H 2 O analyzer. Hair coat surface temperature was measured using infrared thermography. We chose the same body regions that were analyzed for CET. Body surface temperature did not differ between the flank and hindquarters, but both these areas differed from the neck, which had the highest mean temperature. CET did not differ between body regions. No statistical difference was found for mean CET between TA classes 29 °C. Under conditions of high temperature and shading, CET is positively related to environmental temperature and is homogeneously distributed over the body surface of calves.

Perfil bioquímico sérico de bezerros de origem leiteira aleitados com dietas líquidas alternativas

O perfil metabolico e utilizado como monitoramento rotineiro para o diagnostico de transtornos metabolicos, deficiencias nutricionais e como preventivo de transtornos subclinicos, alem da pesquisa de problemas de saude e de desempenho de um rebanho. Neste contexto, o objetivo do presente trabalho foi avaliar a influencia de diferentes dietas liquidas contendo soro de queijo e colostro sobre os perfis dos metabolitos sericos de bezerros durante a fase de aleitamento. Foram utilizados 24 bezerros mesticos provenientes de rebanhos leiteiros da regiao, distribuidos em delineamento inteiramente casualizado com tres tratamentos e oito repeticoes: LI = Leite integral (controle); LS = 50% Leite integral + 50% de Soro de queijo in natura; SC = 70% de Soro de queijo in natura + 30% Colostro. Semanalmente foram coletadas amostras de sangue por puncao jugular externa, no periodo da manha, antes do fornecimento da dieta liquida e duas horas apos a ingestao desta. As concentracoes dos parâmetros sericos avaliados diferiram entre os tratamentos, porem sem comprometer o desempenho dos animais. Desse modo, a utilizacao de soro de queijo associado ao colostro apresenta-se como forma viavel de reducao de custos com aleitamento de bezerros, visto que possiveis deficits causados pelas diferencas nutricionais das dietas liquidas sao supridos pelos alimentos solidos, nao afetando os perfis dos metabolitos sericos relacionados ao status proteico e energetico.