Efeito da época do ano, temperatura e umidade relativa do ar na performance de suínos em crescimento e terminação.

Efeito da época do ano temperatura e umidade relativa do ar desempenho de suínos em crescimento e terminação

Composição química, energética e proteina discutível de alguns alimentos para suínos.

21 alimentos utilizados na alimentação de suínos foram determinados, a analise proximal, os minerais, aminoacidos, a matéria seca digestivel o coeficiente de digestibilidade da proteina bruta a energia digestivel e a energia metabolizavel.Resumo

Efeito da época do ano, temperatura e umidade relativa do ar no desempenho de suínos em crescimento e terminação.

Foi analizado o efeito da época do ano no desempenho de suínos machos não castrados dos 25 aos 100 kg de peso vivo. A analise da temperatura e umidade relativa do ar o ganho de peso dos suínos foi maior quando a temperatura e mais baixa e mais elevadas

Growth, blood, carcass and meat quality traits from local pig breeds and their crosses

Contrary to intensive pig production, local pig breeds and their production systems are able to respond to the high criteria and expectations of modern society in regard to some environmental aspects, animal welfare, food quality and healthiness. This study proposes the recovery, study and use of a cross between two local breeds, contributing to animal biodiversity conservation and to the income of local pig producers. This work studied the growth performance and blood, carcass and meat quality traits of Alentejano (AL), Bísaro (BI) and Ribatejano (RI) (AL × BI, BI × AL) castrated male pigs. Raised outdoors, pigs were fed commercial diets ad libitum and killed at ~65 kg (trial 1, n = 10 from each genotype) and ~150 kg BW (trial 2, n = 9 from each genotype). In trial 1, AL and AL × BI attained slaughter weight later than BI and BI × AL pigs, with AL presenting lower average daily gains than the other genotypes ( P < 0.001). Alentejano and RI pigs presented higher ( P < 0.01) levels of plasma total protein than BI. Overall, carcass traits were affected by genotype, with length ( P < 0.01), yield ( P = 0.07) and lean cut proportions ( P < 0.01) lower in AL than BI, and intermediate values for crossed pigs. Conversely, AL pigs presented higher fat cut proportion ( P < 0.01), average backfat thickness ( P < 0.001) and ‘zwei punkte’ fat depth ( P < 0.01) than BI and RI pigs. Alentejano pigs also presented higher Longissimus lumborum (LL) intramuscular fat ( P < 0.05), myoglobin content and ultimate pH ( P < 0.01), but lower total collagen ( P < 0.05), drip ( P < 0.001) and cooking losses ( P < 0.01), and shear force ( P < 0.001) than all other genotypes. Finally, LL showed a more intense red colour in AL than in BI pigs. In trial 2, AL pigs confirmed to be a slow-growing obese breed with lower bone and lean cut proportions than BI, and higher LL intramuscular fat, richer colour, lower water loss and higher tenderness. In both trials, RI pigs grew faster, with higher lean and lower fat cut proportions and backfat thickness, and with overall LL characteristics comparable to those observed in AL pigs. This work demonstrates some clear differences between AL and BI breeds while showing that their crosses present intermediate characteristics in most studied traits. These data on RI pigs can be useful to breeders’ associations and farmers in order to consider the use of these crosses as an option or complement to pure line breeding

Portuguese Local pig breeds: genotype effects on meat and fat quality traits

This work investigated the contribution of cross‐breeding between two local Portuguese pig breeds to the conservation of animal biodiversity and income of local pig producers. Quality traits of semimembranosus (SM), gluteus medius (GM) and dorsal subcutaneous fat (DSF) were studied in Alentejano (AL), Bísaro (BI), AL × BI, and BI × AL (Ribatejano—RI) castrated male pigs. Pigs were reared outdoors, fed ad libitum, and slaughtered at ~65 (trial 1) and 150 kg BW (trial 2). In trial 1, AL pigs showed higher SM intramuscular fat, lower total collagen, and higher soluble collagen than BI pigs, while AL × BI and BI × AL pigs showed intermediate (NS) values. AL, AL × BI, and BI × AL pigs showed higher SM myoglobin content, and AL a more intense red colour than BI pigs. Finally, AL, AL × BI, and BI × AL showed higher total lipids in DSF than BI pigs. In trial 2, SM and DSF results were similar to those obtained in trial 1. In GM, AL and BI × AL showed higher intramuscular fat than BI and AL × BI pigs, while AL, AL × BI and BI × AL showed lower total collagen content than BI pigs. In conclusion, these results suggest that RI crosses are a productive alternative, with overall muscle and DSF traits statistically not different between AL × BI and BI × AL, and similar to those observed in AL pigs

Influência da substituição do milho e do farelo de soja no balanço proteico energético em suínos.

Influência da substituição do milho e do farelo de soja no balanço proteico energético em suínos

Simulation of a-Si PV system linked to the grid by DC-DC boost and two-level converter

This paper is about a PV system linked to the electric grid by power electronic converters. The modeling for the converters emulates the association of a DC-DC boost with a twolevel power inverter in order to follow the performance of a testing commercial inverter employed on an experimental system. It is used pulse width modulation by sliding mode control associated with space vector modulation for control the boost and the inverter. The PV system is described by the five parameters equivalent circuit and parameter identification is carried out. Maximum power point tracking is implemented by a P V procedure. Simulation studies are performed and a comparison with the testing experimental system is presented

Balanço energético e proteico de rações para suínos machos, inteiros e castrados, de diferentes raças e pesos.

Determinar o efeito do sexo( animais inteiros e castrados) da raça(Landrace, Large white e cruza landrace X large white) e dos pesos ou períodos sobre o balanço energético e proteico de uma ração que tinha por base milho e farelo de soja para suínos

Ração para porcas gestantes confinadas em grupo.

Resumo