4 research outputs found
Productive Characterization of Milk Farms Using Multivariate Analysis
Este trabajo tuvo como objetivo caracterizar sistemas productivos
lecheros de la comuna de Vilcún, provincia de CautÃn, IX
Región, Chile, relacionando variables cualitativas y cuantitativas
aplicando para ello análisis estadÃstico multivariado de correspondencia
simple. Se encuestaron 24 fincas lecheras: 11
consideradas pequeñas, 7 medianas y 6 grandes productores
lecheros. Los resultados generales muestran que los productores
grandes tienen mayor superficie de hectáreas dedicadas a
la lecherÃa, mayor número de dÃas de lactancias de sus vacas
y una producción promedio de 14 L vaca dÃa –1, en comparación
con 9 L vaca dÃa –1 de los medianos y pequeños productores.
Por otro lado, el análisis multivariado de correspondencia
simple muestra asociación entre el nivel educacional de los
productores y la cantidad de leche producida. Es asà que los
productores grandes poseen un tÃtulo profesional de nivel superior
técnico o de ingeniero. Asà mismo, el nivel de escolaridad
de los ordeñadores es básico completo para los productores
grandes y básico completo e incompleto para los pequeños
y medianos productores. Los productores que realizan dos
ordeños/dÃa tienen mayor producción total de leche, y la terapia
de secado se lleva a cabo más en productores grandes y
medianos que en los pequeños. El uso de estanque de frÃo es
de uso permanente en los productores con mayor volumen
productivo. Finalmente, los grandes productores usan registros
reproductivos asociándose esto a sus altas producciones. En
el aspecto sanitario se observa que los productores con mayor
antigüedad en el rubro lechero tienen menos problemas de
mastitis en su rebaño.The objective of this study was to characterize dairy productive
systems of Vilcún commune, CautÃn province, the IXth Region,
Chile, linking qualitative and quantitative variables using statistical
multivariate analysis of simple correspondence. 24 dairy
farms were analyzed: 11 considered small size, 7 medium
ones and 6 big dairy producers. The general results show that
the big producers have a larger surface of hectares dedicated
to the dairy, more days of lactation and an average production
of 14 L per day, in comparison with 9 L of the medium and
small producers. The multivariable analysis of simple correspondence
shows association between the educational level of
the dairy producers and the quantity of produced milk. Thus,
big producers have possess a professional title of degree senior
technician or engineer. On the other hand, the level of education
of the milkers was at least secondary level for the big
producers and basic complete and incomplete for the small
and medium producers. Likewise, the producers who carry out
twice-daily milking have bigger total production of milk, and the
drying therapy is carried out more in big and medium producers
than in the small ones. The use of cooling tank is of permanent
use in the producers with a greater productive volume. Finally,
the big producers used a reproductive records which are
associated with their high productions. About the sanitary aspect
was observed that the producers with more seniority in
the business have fewer mastitis problems in their her
Conjugated linoleic acid content in milk of Chilean Black Friesian cows under pasture conditions and supplemented with canola seed (Brassica napus) concentrate
At present, there is limited and contradictory information about the effects of the use of canola (Brassica napus) seed as supplement on the contents of conjugated linoleic acid (CLA) in milk of grazing cows. The objective of this study was to evaluate the effect of a dietary supplement with canola seed on the production and composition of milk, and CLA concentration in Chilean Black Friesian cows under pasture conditions. Three experiments were done. Experiment 1: control group was fed 5 kg d(-1) of commercial concentrate without canola (0-TC1) and treatment group that was fed 3.75 kg of commercial concentrate plus 1.16 kg of whole canola seed (1.16-TC1). Experiment 2: Control group was fed 8 kg d(-1) commercial concentrate without canola (0-TC2) and treatment group that was fed 6.2 kg of commercial concentrate plus 1.2 kg of ground canola seed (1.2-TC2). Experiment 3: control group was fed 6 kg d(-1) commercial concentrate without canola (0-TC3) and treatment group was fed 6 kg of commercial concentrate with 20% of whole canola seed (1.2 kg d(-1), 1.2-TC3). The duration of each experiment was 60 days. No differences in milk production and quality were observed among the experimental groups in every assay. The CLA isomers trans-10, cis-12 and cis-10, cis-12 were higher than those normally found in the scientific literature. There was no effect of the inclusion of canola seed on total CLA content or the content of cis-9, trans-11, trans-10, cis-12 and cis-10, cis-12 isomers
Productive Characterization of Milk Farms Using Multivariate Analysis
The objective of this study was to characterize dairy productive systems of Vilcun commune, Cautin province, the IXth Region, Chile, linking qualitative and quantitative variables using statistical multivariate analysis of simple correspondence. 24 dairy farms were analyzed: 11 considered small size, 7 medium ones and 6 big dairy producers. The general results show that the big producers have a larger surface of hectares dedicated to the dairy, more days of lactation and an average production of 14 L per day, in comparison with 9 L of the medium and small producers. The multivariable analysis of simple correspondence shows association between the educational level of the dairy producers and the quantity of produced milk. Thus, big producers have possess a professional title of degree senior technician or engineer. On the other hand, the level of education of the milkers was at least secondary level for the big producers and basic complete and incomplete for the small and medium producers. Likewise, the producers who carry out twice-daily milking have bigger total production of milk, and the drying therapy is carried out more in big and medium producers than in the small ones. The use of cooling tank is of permanent use in the producers with a greater productive volume. Finally, the big producers used a reproductive records which are associated with their high productions. About the sanitary aspect was observed that the producers with more seniority in the business have fewer mastitis problems in their herd
Effect of extruded whole soybean dietary concentrate on conjugated linoleic acid concentration in milk in Jersey cows under pasture conditions
Contradictory results has been found on the effects of soybean supplementation and conjugated linoleic acid (CLA) content in milk on feeding systems based on fresh forage The objective of the study was to evaluate the effect of a dietary supplement with different quantities of extruded whole soybean on the production and composition of milk, and CLA concentration or their isomers in Jersey cows under pasture conditions. Twenty-one Jersey cows were randomly assigned into 3 groups of 7 animals each. The cows were supplemented with a dietary concentrate (5 kg d(-1)), and each group received one of the three next treatments: control without soybean (0-SB), with extruded whole soybean at 0.5 kg d(-1) (0.5-SB) or at 1 kg d(-1) (1-SB). The basic diet was a pasture composed of Lolium perenne (70%), Trifblium repens (25%) and other species. The duration of the study was 75 d. Milk production (p = 0.706) and protein production (p = 0.926) were not affected by treatments. Fat (p = 0.015) and protein (p = 0.045) content as well as fat production (p = 0.010) were lower in the 1-SB group. There was no effect of the inclusion of extruded soybean on total CLA content (p = 0.290) or the content of cis-9, trans-11 (p = 0.582), trans-10, cis-12 (p = 0.136) and cis-10, cis-12 (p = 0.288) isomers. However, concentrations of all isomers were affected by the nutritional quality of the pasture, with low values observed at greater maturity stages of pasture