Natalia Aguilar - Academia.edu (original) (raw)

Papers by Natalia Aguilar

Journal of Applied Animal Research, 2020

To evaluate the foraging behaviour of yearling bulls grazing on Marandu grass, we conducted two e... more To evaluate the foraging behaviour of yearling bulls grazing on Marandu grass, we conducted two experiments. In the first experiment (Exp. 1), three grazing heights of 15, 25, and 35 cm were evaluated, with bulls receiving 0.3% of body weight (BW) of supplement (161 g kg-1 crude protein (CP) and 20.1 MJ kg-1 gross energy (GE)); in the second experiment (Exp. 2), supplementation levels were decreased as grazing height increased: (1) low height (15 cm) and high supplementation (0.6% BW: 142 g kg-1 CP and 18.9 MJ kg-1 GE (LH-HS)); (2) moderate height (25 cm) and moderate supplementation (0.3% BW: 161 g kg-1 CP and 20.1 MJ kg-1 GE (MH-MS)) or (3) high height (35 cm) without supplementation (HH-WS). Ingestive behaviour was evaluated by direct visual observations, and intake using markers. It was used 9 paddocks each experiment. The experimental design was completely randomized, analysing effects by polynomial orthogonal contrasts (Exp. 1) and Tukey test (Exp. 2). In Exp. 1, a linear decreasing response to daily grazing time (P < 0.01) was observed, whereas a linear increasing response to herbage intake (P < 0.01) was observed with increased grazing height. In Exp. 2, LH-HS bulls had lower herbage intake (P < 0.01) than their counterparts. Bulls from both experiments showed increased grazing activity after 12 PM (P < 0.05). The herbage intake substitution effect of supplements can be explored as a production strategy, as the adjustment of supplementation levels can promote high dry matter intake as well as performance in beef cattle, in conditions of low grazing height or low forage allowance, even with a high stocking rate.

Comportamiento ingestivo en vaquillas cruza Cebú en pastoreo, que reciben suplementación energético proteica

Argentina: Estación experimental …, 2002

... La practica de suplementar en pastoreo, para lograr mayor ganancia diaria de peso, se realiza... more ... La practica de suplementar en pastoreo, para lograr mayor ganancia diaria de peso, se realiza para modificar o remediar la deficiencia energético proteica en las pasturas (Krysl and Hess 1993). ... Hess, BW, Krysl LJ, Judkins, MB, Park KK, Mc Cracken, BA and Hanks DR 1992. ...

¿Cómo Mejorar El Bienestar Durante La Separación De La Vaca y El Ternero? (How to Improve the Welfare During the Separation of the Cow and the Calf?)

Journal of Applied Animal Research, 2020

To evaluate the foraging behaviour of yearling bulls grazing on Marandu grass, we conducted two e... more To evaluate the foraging behaviour of yearling bulls grazing on Marandu grass, we conducted two experiments. In the first experiment (Exp. 1), three grazing heights of 15, 25, and 35 cm were evaluated, with bulls receiving 0.3% of body weight (BW) of supplement (161 g kg-1 crude protein (CP) and 20.1 MJ kg-1 gross energy (GE)); in the second experiment (Exp. 2), supplementation levels were decreased as grazing height increased: (1) low height (15 cm) and high supplementation (0.6% BW: 142 g kg-1 CP and 18.9 MJ kg-1 GE (LH-HS)); (2) moderate height (25 cm) and moderate supplementation (0.3% BW: 161 g kg-1 CP and 20.1 MJ kg-1 GE (MH-MS)) or (3) high height (35 cm) without supplementation (HH-WS). Ingestive behaviour was evaluated by direct visual observations, and intake using markers. It was used 9 paddocks each experiment. The experimental design was completely randomized, analysing effects by polynomial orthogonal contrasts (Exp. 1) and Tukey test (Exp. 2). In Exp. 1, a linear decreasing response to daily grazing time (P < 0.01) was observed, whereas a linear increasing response to herbage intake (P < 0.01) was observed with increased grazing height. In Exp. 2, LH-HS bulls had lower herbage intake (P < 0.01) than their counterparts. Bulls from both experiments showed increased grazing activity after 12 PM (P < 0.05). The herbage intake substitution effect of supplements can be explored as a production strategy, as the adjustment of supplementation levels can promote high dry matter intake as well as performance in beef cattle, in conditions of low grazing height or low forage allowance, even with a high stocking rate.

Comportamiento ingestivo en vaquillas cruza Cebú en pastoreo, que reciben suplementación energético proteica

Argentina: Estación experimental …, 2002

... La practica de suplementar en pastoreo, para lograr mayor ganancia diaria de peso, se realiza... more ... La practica de suplementar en pastoreo, para lograr mayor ganancia diaria de peso, se realiza para modificar o remediar la deficiencia energético proteica en las pasturas (Krysl and Hess 1993). ... Hess, BW, Krysl LJ, Judkins, MB, Park KK, Mc Cracken, BA and Hanks DR 1992. ...

¿Cómo Mejorar El Bienestar Durante La Separación De La Vaca y El Ternero? (How to Improve the Welfare During the Separation of the Cow and the Calf?)