Performance, body development and ingestive behavior of Nelore and crossbred heifers finished in a grazing system

被引:0
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作者
Millena Vitória da Silva
Marcelo Vedovatto
André Luiz Julien Ferraz
Micheline Feitosa Castro
Isabela Pinto Gonçalves
Andressa Rayane Silva
Lidianny dos Santos Amorim
Maria Simara Palermo Hernandes
Aldair Félix da Silva
Marcus Vinícius Morais de Oliveira
Dalton Mendes de Oliveira
机构
[1] Universidade Estadual de Mato Grosso do Sul – UEMS,Dean Lee Research and Extension Center
[2] Louisiana State University,Faculdade de Medicina Veterinária E Zootecnia
[3] Universidade Federal de Mato Grosso Do Sul,undefined
来源
Tropical Animal Health and Production | 2024年 / 56卷
关键词
Crossbreeding; Extensive system; Growth performance; Ultrasound;
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摘要
The aim of this experiment was to evaluate growth, body development and ingestive behavior of Nelore and crossbred heifers. Twenty-two contemporary heifers (eight Nelore, seven Nelore × Angus (½ Angus) and seven Nelore × Pantaneiro (½ Pantaneiro) crosses) were evaluated. The variables evaluated were weight, subcutaneous fat thickness [assessed by ultrasound in the longissimus dorsi (SFT) and biceps femoris (SFTP8)] morphometric measures and ingestive behavior (determined between 7 am and 5 pm). The daily gain differed between the breeds (P < 0.05), being greater for the ½ Pantaneiro than Nelore and equal to ½ Angus at the end of the study. The ½ Angus heifers differed (P < 0.01) from the other breeds for SFT (4.36 mm), with no difference between Nelore (2.77 mm) and ½ Pantaneiro (3.38 mm). The SFTP8 was greater (P < 0.01) (5.36 mm) in ½ Angus heifers than t others crossbreed, and greater in ½ Pantaneiro than in Nelore (4.28 vs 3.29 mm). The heart girth and rump width between the ilia were larger (P < 0.01) for the ½ Angus than ½ Pantaneiro and Nelore (169 cm; 41.6 cm, respectively). Substernal height was greatest (P < 0.01) for the Nelore (69.1 cm), reflecting the greater anterior and posterior height. The ½ Angus spent the longest time (P < 0.05) walking and less time grazing. Idleness also differed (P < 0.05) throughout the day. Crossbred heifers exhibited better performance and development than Nelore. The grazing pattern of ½ Pantaneiro heifers was identical to Nelore, but walked less, gained more weight, and exhibited better carcass finishing.
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