DSpace Communidade: Produção Técnico-científica do Departamento de ZootecniaProdução Técnico-científica do Departamento de Zootecniahttps://locus.ufv.br//handle/123456789/117382024-03-29T08:00:01Z2024-03-29T08:00:01ZTifton 85 bermudagrass (Cynodon sp.) silage as a replacement for Tifton 85 hay to feed lactating cowsAvila, André Sanches deZambom, Maximiliane AlavarseFaccenda, AndressaEckstein, Everline InêsAnschau, Fernando AndréGarcias, JessicaSchneider, Cibele ReginaFornari, Josias Luishttps://locus.ufv.br//handle/123456789/319482023-12-12T19:26:32Z2017-09-01T00:00:00ZTítulo: Tifton 85 bermudagrass (Cynodon sp.) silage as a replacement for Tifton 85 hay to feed lactating cows
Autor(es): Avila, André Sanches de; Zambom, Maximiliane Alavarse; Faccenda, Andressa; Eckstein, Everline Inês; Anschau, Fernando André; Garcias, Jessica; Schneider, Cibele Regina; Fornari, Josias Luis
Abstract: The objective of the study was to evaluate the replacement of Tifton 85 hay (TH) for Tifton 85 silage (TS) in the diets of lactating cows. Five Holstein cows in middle of lactation were allocated in a 5 × 5 Latin square design and each experimental period lasted 18 days (12 days for adaptation and six days for collection). Treatments consisted of replacement of 0, 25, 50, 75, and 100% of TH for TS. The intake and digestion of nutrients, microbial protein synthesis, milk yield and composition, and the economic viability of the diets were evaluated. The intakes of dry matter, organic matter, and ether extract had a positive linear effect and the digestibility of dry matter, organic matter, crude protein, neutral detergent fiber, acid detergent fiber decreased linearly with increasing participation of TS. Milk production and composition and microbial protein synthesis were not affected. Regarding economic viability, the treatment with 100% hay produced better results, with better gross margin. The Tifton 85 silage can be used as a replacement for Tifton 85 hay up to 100% without changing the milk production and composition of Holstein cows.
Tipo: Artigo2017-09-01T00:00:00ZNew approaches, development, and improvement of methodologies for the assessment of B-vitamin requirements in dairy cowsGirard, Christiane L.https://locus.ufv.br//handle/123456789/319392023-12-08T18:20:43Z2017-07-01T00:00:00ZTítulo: New approaches, development, and improvement of methodologies for the assessment of B-vitamin requirements in dairy cows
Autor(es): Girard, Christiane L.
Abstract: Studies on B-vitamin requirements of cattle, conducted more than 60 years ago, concluded that mature ruminants do not require B-vitamin supplements because the amounts of vitamins provided by the diet and synthesized by the ruminal microflora were sufficient to prevent emergence of deficiency symptoms. As a result, the impact of subclinical deficiency on maintenance of normal and efficient metabolism has been disregarded and very little research effort has been devoted at defining dairy cow requirements for B vitamins. However, emergence of deficiency symptoms is the last stage of the deficiency; deficiency appears as soon as the supply is inferior to the needs, leading to a loss of metabolic efficiency. As B vitamins play critical roles in carbohydrate, protein, and lipid metabolism, it is likely that the demand for these cofactors increases with milk yield. Reports over the last two decades of beneficial effects of B-vitamin supplementation, such as thiamin, niacin, biotin, folic acid, and vitamin B12, suggested that, under some conditions, the need for B vitamins exceeds the supply from the diet and the synthesis by rumen microbes, leading to sub-optimal milk production and metabolic efficiency. However, responses to B-vitamin supplementation are highly variable. The major challenge faced by studies on B-vitamin requirements of dairy cows is the very limited knowledge on dietary factors driving the fate of B vitamins in rumen. This knowledge is essential to identify the conditions under which the dairy cow could benefit from B-vitamin supplements. The present review aims to describe the present state of knowledge on B-vitamin requirements of dairy cows as well as some of the major problems that need to be overcome to progress in this research field.
Tipo: Artigo2017-07-01T00:00:00ZSubstitution of blood plasma with soy protein concentrate in piglet dietResende, Moisés QueirozMascarenhas, Alessandra GimenezMello, Heloisa Helena de CarvalhoArnhold, EmmanuelTeixeira, Karla AndradeRufino, Luciana MouraNunes, Romão da Cunhahttps://locus.ufv.br//handle/123456789/319382023-12-08T18:15:24Z2017-04-01T00:00:00ZTítulo: Substitution of blood plasma with soy protein concentrate in piglet diet
Autor(es): Resende, Moisés Queiroz; Mascarenhas, Alessandra Gimenez; Mello, Heloisa Helena de Carvalho; Arnhold, Emmanuel; Teixeira, Karla Andrade; Rufino, Luciana Moura; Nunes, Romão da Cunha
Abstract: In this study, we evaluated the effects of substitution of partial and total spray-dried blood plasma (BP) with soy protein concentrate (SPC) in the diet of post-weaning piglets on their performance, intestinal histomorphometry, and blood parameters. Fifty-four castrated male piglets, weaned at an average age of 21 days and an initial average weight of 7.01±0.294 kg, were distributed in a completely randomized block design, with three diets (0%SPC-5%BP, 2.5%SPC-2.5%BP, and 5%SPC-0%BP), six replicates, and three piglets per experimental unit. The experimental feeds were formulated to meet the requirements of the piglets at 21-32 and 33-42 days of age (pre-starter diet) and 43-66 days of age (starter diet). From 21 to 32 and 21 to 42 days of age, daily feed intake, daily weight gain, and final weight of the animals were higher in the group fed 2.5%SPC-2.5%BP and 0%SPC-5%BP. From 21 to 66 days of age, daily weight gain and daily feed intake were higher in the animals fed 2.5%SPC-2.5%BP. No effect was observed on the histomorphometry variables. The total leukocyte count was higher in animals fed 2.5%SPC-2.5%BP and 5%SPC-0%BP and the lymphocyte count was lower in the piglets that received 0%SPC-5%BP. The combined use of soy protein concentrate and spray-dried blood plasma in the feeds of piglets between 21 and 42 days of age improves their productive performance.
Tipo: Artigo2017-04-01T00:00:00ZSheep meat commercialization in the retail market in Brazilian citiesFiretti, RicardoAlberti, Ana Lúcia LuzZundt, MariliceSantos, Aline de OliveiraRego, Fabiola Cristine de AlmeidaAstolphi, José Luis de Limahttps://locus.ufv.br//handle/123456789/319372023-12-08T18:01:13Z2018-01-01T00:00:00ZTítulo: Sheep meat commercialization in the retail market in Brazilian cities
Autor(es): Firetti, Ricardo; Alberti, Ana Lúcia Luz; Zundt, Marilice; Santos, Aline de Oliveira; Rego, Fabiola Cristine de Almeida; Astolphi, José Luis de Lima
Abstract: This paper explored the mix market characteristics of sheep meat as a product for sale in different cities in the states of São Paulo and Paraná. For this, 81 products were purchased in 21 outlets sampled in a “non-probabilistic” manner for convenience and then subjected to analysis of yield of meat, bone, and fat. Imported products represented 20% of the total, being marketed in hypermarkets. It was observed that 37% of the total products were obtained in hypermarkets, 31% in supermarkets, 23% in butcher shops, and 8.6% in meat outlets. Almost 9% of the products had not undergone the official slaughter inspection system. The main types of products identified were palettes and legs with bones (33.3 and 24.7%, respectively); however, only 25% were satisfactorily displayed to consumers. The yields obtained in meat and deboned portions were 74% and 59% of the total weight, significantly affecting the average adjusted sales prices of the products, respectively US$13.01/kg sale price; US$17.82/kg deboned; and US$22.52/kg lean meat. The low yield of clean and boned meat observed in the samples can lead to negative experiences of these products by consumers.
Tipo: Artigo2018-01-01T00:00:00Z