Nutritional influences on growth and onset of puberty in Boran and Boran X Friesian bulls in Ethiopia

Twenty-seven Boran and 37 Boran X Friesian crossbred bulls were weaned at 6 months of age and randomly assigned to either a dry season supplementary feed containing 16% crude protein or control groups. Data were collected on body weight, wither height and scrotal circumference (SC) at monthly interv...

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Published inTheriogenology Vol. 37; no. 5; pp. 1005 - 1016
Main Authors Tegegne, A. (International Livestock Centre for Africa, Addis Ababa, Ethiopia), Entwistle, K.W, Mukasa-Mugerwa, E
Format Journal Article
LanguageEnglish
Published United States 01.05.1992
Subjects
ALIMENT CONCENTRE
ALIMENTOS CONCENTRADOS
BLE
COMPLEMENT ALIMENTAIRE
CRECIMIENTO
CROISSANCE
ESCROTO
ETHIOPIE
ETIOPIA
FERTILIDAD
FERTILITE
GONADOLIBERINE
GUIZOTIA ABYSSINICA
HORMONA LIBERADORA DE GONADOTROPINA
MACHO
MADUREZ SEXUAL
MALE
MATURITE SEXUELLE
MEDICION DEL CUERPO
MENSURATION CORPORELLE
NIVEAU D'ALIMENTATION
NIVEL ALIMENTICIO
PESO
PLASMA SANGUIN
PLASMA SANGUINEO
POIDS
PRODUCTOS DEL CRUZAMIENTO
PRODUIT DE CROISEMENT
PROTEINA BRUTA
PROTEINE BRUTE
RACE
RAZAS
SALVADO
SCROTUM
SEMEN
SON
SPERME
SUPLEMENTOS DE PIENSOS
TAUREAU
TESTOSTERONAS
TESTOSTERONE
TORO
TRIGO
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Summary:Twenty-seven Boran and 37 Boran X Friesian crossbred bulls were weaned at 6 months of age and randomly assigned to either a dry season supplementary feed containing 16% crude protein or control groups. Data were collected on body weight, wither height and scrotal circumference (SC) at monthly intervals. Bulls were also challenged with 100 microgram of gonadotropin releasing hormone (GnRh) at 2-month intervals and plasma testosterone responses were determined. Semen was collected at monthly intervals by electroejaculation. Post weaning average daily weight gain was significantly (P 0.001) higher in supplemented than in control groups (302 vs 208 g/day). Scrotal circumference growth rates were also significantly (P 0.001) higher in supplemented than in control bulls (0.38 vs 0.31 mm/day). Bulls fed supplemented diets were younger (430 vs 473 days; P 0.001) and heavier (217 vs 203 kg; P 0.05) and had better semen quality at puberty than the control bulls. There was a trend for larger SC at puberty in supplemented than in control bulls (P
Bibliography:9310740
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ISSN:0093-691X
1879-3231
DOI:10.1016/0093-691X(92)90099-D