Effects on productive variables with partial substitution of corn with manioc in the diet of pigs during growing stage [Efectos de la sustitución parcial de maíz por harina integral de mandioca sobre variables productivas de cerdos en crecimiento]
Pochon D.O.,Catedra de Bioestadistica |
Koslowski H.A.,Catedra de Bioestadistica |
Picot J.A.,Catedra de Bioestadistica |
Navamuel J.M.,Catedra de Bioestadistica
Revista Veterinaria | Year: 2010
The use of manioc for pig diets is important because of its high composition of carbohydrates, being and excellent source of metabolizable energy. The latter is traditionally achieved by supplying corn as 60-80% of the ration. Agroecological alternatives for a particular geographical area have to be taken into account when considering the replacement of traditional feeding systems for pigs. The purpose of this work was to determine the effects of manioc-based diets on productive variables by replacing traditional corn-based diets with different proportions of integral manioc flour in growing pigs. For this purpose, four male pigs weighing 40.4 ± 0.5 kg were located in 2 m2 corrals with food and water ad libitum during 7 days for adaptation and 14 days for the assay. Different percentages of corn substitution were: balanced ration plus 0, 20, 40 and 60% of manioc flour, for diets 1, 2, 3 and 4, respectively. Proportions of manioc were isoenergetic and isoproteic for all the cases. Variables under analysis were submitted to descriptive analysis and response was estimated by ANOVA with a latin square design, being alpha of 5%. No significant differences for the studied variables were observed for the four diets. Diet 2 showed the highest total and daily weight gain (12±1.63 kg and 1.08±0.13 kg.day-1) as well as the highest daily food intake (2.82±0.32 kg.MS.day-1). This animal needed 2.64±0.38 kg of food per kg of live weight gain. Least live weight gain was registered in the animal fed with diet 3 (10.75±1.26 kg), indicating a daily live weight gain of 0.97±0.11 kg.day-1. It can be concluded that, under this assay conditions, the favorable performance of the experimental group allows the feasibility for the partial replacement of corn with manioc flour for diets of pigs during the growing stage.
Cagliada M.P.,Catedra Of Animales Of Laboratorio |
Carbone C.,Catedra Of Animales Of Laboratorio |
Carbone C.,Executive Committee of the International Council for the Science of Laboratory Animals |
Ayala M.A.,Catedra Of Animales Of Laboratorio |
And 8 more authors.
Revista Argentina de Microbiologia | Year: 2010
The Kilham rat virus (KRV) is a parvovirus originally isolated from a rat sarcoma in the late 1950s. The clinical signs associated with a natural KRV infection include foetal resorption in dams, runtin, ataxia, cerebellar hypoplasia and jaundice in suckling rats, and sudden death, scrotal cyanosis, abdominal swelling and dehydration in juvenile rats. The ability of this virus to produce persistent infections has resulted in a high frequency of contamination of cell cultures and transplantable-tumor system. In addition, the virus may interfere with research in other ways. The remarkable resistance to environmental conditions determines the importance of the detection and control of this agent, especially in the laboratory animal production. This study determines the seroprevalence of Kilham antibodies from sera of adult rats from conventional facilities, using the haemagglutination inhibition test. The seroprevalence varied between 27.8% and 75%. This result confirms that the virus is circulating in Argentinean conventional facilities and might be interfering with research. The recognized Kilham virus may be prevented from supply sources by implementing a health monitoring schedule including a regular serological surveillance, and by keeping the animals under barrier systems.