Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs
The objective of the study was to evaluate body growth and age at onset of puberty on lambs fed two specific diets for low and high growth rates. A herd of 20 Brazilian Bergamasca lambs was divided in two groups (n= 10) and kept confined throughout the experimental period, two animals of the same tr...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Universidade Federal de Minas Gerais
2016-02-01
|
| Series: | Arquivo Brasileiro de Medicina Veterinária e Zootecnia |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000100022&lng=en&tlng=en |
| _version_ | 1818887730078154752 |
|---|---|
| author | A. Dantas E.R. Siqueira S. Fernandes E. Oba A.M. Castilho P.R.L. Meirelles M.M.P. Sartori P.T.R. Santos |
| author_facet | A. Dantas E.R. Siqueira S. Fernandes E. Oba A.M. Castilho P.R.L. Meirelles M.M.P. Sartori P.T.R. Santos |
| author_sort | A. Dantas |
| collection | DOAJ |
| description | The objective of the study was to evaluate body growth and age at onset of puberty on lambs fed two specific diets for low and high growth rates. A herd of 20 Brazilian Bergamasca lambs was divided in two groups (n= 10) and kept confined throughout the experimental period, two animals of the same treatment/pen. Two phases were established: Phase 1, from 90 days of age until the onset of puberty; and Phase 2, from puberty onset up to 1 year old. For Phase 1, two distinct diets were formulated, being: Treatment A, which was formulated to obtain an average daily gain of approximately 150g; and Treatment B, for an average daily gain of about 250g. In Phase 2, a balanced, equal diet was provided to both groups. Every 14 days, the animals were weighed and given average daily gain, average daily dry matter intake and body condition score. From the 5th month of age on, in each group, a vasectomized male was used to detect estrus, establishing age at puberty onset and estrus interval for each lamb. Blood samples were collected every 28 days to determine plasma growth hormone concentration. Treatment B lambs gained more weight and had higher body condition score (P<0.05) and there was no difference for age at puberty onset and plasma growth hormone levels (P>0.05) between treatments. It was found that both treatments showed satisfactory performances. Thus, treatment A may be indicated as a reasonable feeding system to achieve positive responses on confined ewe lambs during growth phase. |
| first_indexed | 2024-12-19T16:41:52Z |
| format | Article |
| id | doaj.art-f8aa7884c402406c958b56c00c2fdd17 |
| institution | Directory Open Access Journal |
| issn | 1678-4162 |
| language | English |
| last_indexed | 2024-12-19T16:41:52Z |
| publishDate | 2016-02-01 |
| publisher | Universidade Federal de Minas Gerais |
| record_format | Article |
| series | Arquivo Brasileiro de Medicina Veterinária e Zootecnia |
| spelling | doaj.art-f8aa7884c402406c958b56c00c2fdd172022-12-21T20:13:47ZengUniversidade Federal de Minas GeraisArquivo Brasileiro de Medicina Veterinária e Zootecnia1678-41622016-02-01681222810.1590/1678-4162-8278S0102-09352016000100022Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambsA. DantasE.R. SiqueiraS. FernandesE. ObaA.M. CastilhoP.R.L. MeirellesM.M.P. SartoriP.T.R. SantosThe objective of the study was to evaluate body growth and age at onset of puberty on lambs fed two specific diets for low and high growth rates. A herd of 20 Brazilian Bergamasca lambs was divided in two groups (n= 10) and kept confined throughout the experimental period, two animals of the same treatment/pen. Two phases were established: Phase 1, from 90 days of age until the onset of puberty; and Phase 2, from puberty onset up to 1 year old. For Phase 1, two distinct diets were formulated, being: Treatment A, which was formulated to obtain an average daily gain of approximately 150g; and Treatment B, for an average daily gain of about 250g. In Phase 2, a balanced, equal diet was provided to both groups. Every 14 days, the animals were weighed and given average daily gain, average daily dry matter intake and body condition score. From the 5th month of age on, in each group, a vasectomized male was used to detect estrus, establishing age at puberty onset and estrus interval for each lamb. Blood samples were collected every 28 days to determine plasma growth hormone concentration. Treatment B lambs gained more weight and had higher body condition score (P<0.05) and there was no difference for age at puberty onset and plasma growth hormone levels (P>0.05) between treatments. It was found that both treatments showed satisfactory performances. Thus, treatment A may be indicated as a reasonable feeding system to achieve positive responses on confined ewe lambs during growth phase.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000100022&lng=en&tlng=ennutriçãodesempenhoreproduçãohormônio do crescimentoovino |
| spellingShingle | A. Dantas E.R. Siqueira S. Fernandes E. Oba A.M. Castilho P.R.L. Meirelles M.M.P. Sartori P.T.R. Santos Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs Arquivo Brasileiro de Medicina Veterinária e Zootecnia nutrição desempenho reprodução hormônio do crescimento ovino |
| title | Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs |
| title_full | Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs |
| title_fullStr | Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs |
| title_full_unstemmed | Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs |
| title_short | Influence of feeding differentiation on the age at onset of puberty in Brazilian Bergamasca dairy ewe lambs |
| title_sort | influence of feeding differentiation on the age at onset of puberty in brazilian bergamasca dairy ewe lambs |
| topic | nutrição desempenho reprodução hormônio do crescimento ovino |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000100022&lng=en&tlng=en |
| work_keys_str_mv | AT adantas influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT ersiqueira influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT sfernandes influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT eoba influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT amcastilho influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT prlmeirelles influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT mmpsartori influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs AT ptrsantos influenceoffeedingdifferentiationontheageatonsetofpubertyinbrazilianbergamascadairyewelambs |