The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
This research was conducted to evaluate the energy and the fiber digestibility of diets containing urea, starea and cottonseed meal as nitrogen sources and corn silage as forage. Twenty-four lambs averaging 11 months old and initial 31 kg LW and total feces collection method were used. Dry matter intake was 64.1, 68.8 and 71.4 g /kg PV.75 /day and the energy, NDF and CF digestibilities were 63.0, 67.7 and 64.4%, 39.6, 55.7 and 50.0%, 47.0, 49.3 and 53.4%, for the diets with urea, starea and cottonseed meal, respectively. The average weights gain were 278.5, 348.0 and 293.7 g/anim./day, in the same above sequence. The use of starea would be more adequate in relation to urea and cottonseed meal in diets with corn silage as forage for lambs.
Apparent digestibility of energy and fiber of sheep diets containing urea, starea or cottonseed meal
Ezequiel,Jane Maria Bertocco and Matarazzo,Soraia Vanessa and Salman,Ana Karina Dias and Júnior,Ademir Pereira Martins and Soares,Weber Vilas Bôas and Seixas,José Renato Caleiro. Apparent digestibility of energy and fiber of sheep diets containing urea, starea or cottonseed meal. R. Bras. Zootec. [online]. 2001, vol.30, 1, [cited 2026-06-03], pp.231-235. Available from: <https://rbz.org.br/article/apparent-digestibility-of-energy-and-fiber-of-sheep-diets-containing-urea-starea-or-cottonseed-meal/>. ISSN 1516-3598. http://doi.org/10.1590/S1516-35982001000100032.
Ezequiel,Jane Maria Bertocco; Matarazzo,Soraia Vanessa; Salman,Ana Karina Dias; Júnior,Ademir Pereira Martins; Soares,Weber Vilas Bôas; Seixas,José Renato Caleiro. Apparent digestibility of energy and fiber of sheep diets containing urea, starea or cottonseed meal. R. Bras. Zootec., v.30, 1, p. 231-235. Feb. 2001. Available from: <https://rbz.org.br/article/apparent-digestibility-of-energy-and-fiber-of-sheep-diets-containing-urea-starea-or-cottonseed-meal/>. acess on 03 Jun. 2026. http://doi.org/10.1590/S1516-35982001000100032.
Ezequiel,Jane Maria Bertocco, & Matarazzo,Soraia Vanessa, & Salman,Ana Karina Dias, & Júnior,Ademir Pereira Martins, & Soares,Weber Vilas Bôas, & Seixas,José Renato Caleiro. (2001). Apparent digestibility of energy and fiber of sheep diets containing urea, starea or cottonseed meal. R. Bras. Zootec., 30(1) , 231-235. http://doi.org/10.1590/S1516-35982001000100032.
EzequielJane Maria Bertocco, MatarazzoSoraia Vanessa, SalmanAna Karina Dias, JúniorAdemir Pereira Martins, SoaresWeber Vilas Bôas, SeixasJosé Renato Caleiro. Apparent digestibility of energy and fiber of sheep diets containing urea, starea or cottonseed meal. R. Bras. Zootec. [Internet]. 2001 Feb [cited 2026 Jun 03]; 30(1): 231-235. Available from: https://rbz.org.br/article/apparent-digestibility-of-energy-and-fiber-of-sheep-diets-containing-urea-starea-or-cottonseed-meal/. http://doi.org/10.1590/S1516-35982001000100032.
Figure 2
Evolution of cow weight according to the genetic group of calves, from farrowing to weaning.
PCH - calves from predominantly Charolais cows; PNE - calves from predominantly Nellore cows; AACH - calves from breed bulls Aberdeen Angus and predominantly Charolais cow; AANE - calves from breed bulls Aberdeen Angus and predominantly Nellore cow.
