Fernando Bargo - Academia.edu (original) (raw)

Papers by Fernando Bargo

Journal of Animal Science

Eighty-four Angus crossbred heifers (13 ± 1 mo of age, 329.5 ± 61.92 kg of body weight [BW]) were... more Eighty-four Angus crossbred heifers (13 ± 1 mo of age, 329.5 ± 61.92 kg of body weight [BW]) were used in a generalized randomized block design with a 2 × 2 factorial arrangement of treatments. The factors evaluated were: 1) diet type (whole plant sorghum silage [SS] vs. byproducts-based [BP]), and 2) feed additive: Aspergillus oryzae prebiotic (AOP; 2 g/d) vs. Negative control (CTL; 0 g/d), resulting in four treatments: sorghum silage-control (SC), sorghum silage-AOP (SA), byproducts-control (BC), and byproducts-AOP (BA). Heifers were stratified by body weight (BW), randomly assigned to treatments (21 heifers per treatment) and housed in 12 pens equipped with two GrowSafe feed bunks each to measure individual dry matter intake (DMI). After a 14-d adaptation, BW was measured every 14 d for 56 d. Chewing activity was monitored through collar-mounted HR-Tags (heat-related tags). Following the performance period, apparent total tract digestibility was measured in 40 heifers, using indi...

El uso de pasturas en la alimentación de vacas lecheras resulta en un sistema de alimentación de ... more El uso de pasturas en la alimentación de vacas lecheras resulta en un sistema de alimentación de bajo costo ya que las pasturas son la fuente de nutrientes más barata (Clark and Kanneganti, 1998; Peyraud and Delaby, 2001). Los sistemas pastoriles eficientes se caracterizan por una alta producción de leche por unidad de superficie, mientras que los sistemas en confinamiento se caracterizan por una alta producción por vaca (Clark and Kanneganti, 1998). Las pasturas usadas para vacas lecheras son comúnmente pasturas templadas, que se pueden describir como pasturas de alta calidad con 18 a 24%

The Professional Animal Scientist, 2004

Twenty multiparous Holstein cows were used in a completely randomized design with repeated measur... more Twenty multiparous Holstein cows were used in a completely randomized design with repeated measures to study milk production of cows supplemented or not supplemented with concentrate when they were switched to a total mixed ration (TMR) after grazing. In one group, cows grazed an or-chardgrass/bromegrass pasture and were assigned to one of two treatments: 1) unsupplemented (U; 1 kg/d mineral mix) or 2) concentrate supplemented (CS; 1 kg corn-based concentrate/4 kg milk). Total DMI was greater (26.5 vs 22.0 kg/d), but pasture DMI was less (16.8 vs 21.2 kg/ d), for CS cows because of the substitution rate of 0.49 kg pasture/kg concentrate. Overall, CS cows had greater 3.5% fat-corrected milk (FCM) (32.9 vs 26.5 kg/d), but less milk urea N (MUN; 9.6 vs 14.7 mg/dL) and milk fat (3.13% vs 3.88%), than U cows. Milk response to supplementation averaged 1.08 kg milk/kg concentrate. Cows assigned to both treatments lost BW (-17 kg/d) and body condition score (BCS) (-0.33). At the end of the 6-wk grazing period, all cows were switched to a TMR fed in confinement for 11 wk. Overall, DMI (24.3 kg/d), 3.5% FCM (30.6 kg/d), milk fat (3.26%), milk true protein (2.87%), and MUN (12.7 mg/dL) did not differ between treatments. Cows gained BW (53 kg) and BCS (0.33). A significant treatment × time interaction was found for milk yield. During the first day of TMR feeding, milk yield was greater (30.9 vs 19.3 kg/d) for CS cows. After 10 d on a TMR, milk yields between cows that had previously been on the U or CS treatments did not differ (35.5 kg/d). When cows were switched from only pasture to a TMR, milk yield was comparable with that of cows fed CS after 10 d. Lack of carry-over effects of previous treatments and increased production suggest improvement in nutrition and the potential for greater animal well-being for cows housed in a tiestall barn and fed a nutritionally complete TMR.

Journal of Dairy Science, 2003

Journal of Dairy Science, 2002

Journal of Dairy Science, 2004

Journal of Dairy Science, 2003

Journal of Dairy Science, 2004

Journal of Dairy Science, 2003

Journal of Dairy Science, 2001

Journal of Dairy Science, 2002

Livestock Production Science, 2004

... GF Schroeder E-mail The Corresponding Author , a , 1 , GA Gagliostro Corresponding Author Con... more ... GF Schroeder E-mail The Corresponding Author , a , 1 , GA Gagliostro Corresponding Author Contact Information , E-mail The Corresponding Author , b , F ... Alter the milk fat composition by increasing long-chain unsaturated FA, conjugated linoleic acids (CLA), and decreasing ...