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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
28/11/2023 |
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Autoria: |
McNATTY, K. P.; LUN, S.; HEATH, D.; HUDSON, N.; McDIARWID, J.; BALL, P.; SMITH, P.; HENDERSON, K. M. |
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Título: |
Ovarian follicular development in Booroola ewe lambs and in highly fecun Booroola ewes. |
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Ano de publicação: |
1986 |
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Fonte/Imprenta: |
Proceedings New Zealand Society Animal Production, v. 46, p. 241-244, Jan. 1986. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: At 3 months of age, the ovaries of F+ Booroola lambs [i.e. those heterozygous for the fecundity (F)-gene] were lighter (P<0.01) than those of ++ Booroola lambs (i.e. those without the F-gene) which were of similar age and body weight. However, the number of follicles (? 1 mm diam.) in the above F+ lambs was 1.5 fold greater (P<0.01) than that in the ++ lambs. In lambs of both genotypes, ovarian follicles were active in synthesising testosterone and oestradiol and of reaching diameters which were similar to those of preovulatory follicles in mature ewes. However, none of the ovaries showed evidence of recent ovulations. In Booroola ewes (4 to 8 years of age), the proportions of small ovarian follicles (0.5 to 1.0 mm diam.) that synthesised progesterone, androstenedione and oestradiol in culture were related (P<0.05) to genotype (homozygous, FF > F+ > ++ ewes). Also in the above ewes, follicles in the FF and F+ animals reached maturity at smaller diameters than in ++ animals, namely 3.4 ± 0.3, 4.1 ± 0.2 and 6.8 ± 0.3 mm (mean ± s.e.m.; n=3 ewes/genotype) respectively. During a clopreostenol-induced follicular phase, the oestradiol secretion rates from FF ewes with 4.8 ± 0.3 `oestrogenic` follicles, F+ ewes with 3.2 `oestrogenic` follicles and ++ ewes with 1.5 ± 0.02 such follicles were similar as were the mean total numbers of oestradiol-secreting (i.e., granulosa) cells from these follicles, that is 5.4 x 106 cells in each genotype. Collectively these findings show that the Booroola F-gene is expressed in the ovaries of ewes before puberty and during the earliest stages of follicular development. Moreover, as follicles in Booroola ewes with the F-gene mature at smaller diameters, the maturation of 5 or more follicles in FF ewes and 3 to 4 such follicles in F+ ewes may be necessary to produce the same number of oestrogen-producing (i.e. granulosa) cells as that from 1 or 2 mature follicles in ++ ewes. MenosAbstract: At 3 months of age, the ovaries of F+ Booroola lambs [i.e. those heterozygous for the fecundity (F)-gene] were lighter (P<0.01) than those of ++ Booroola lambs (i.e. those without the F-gene) which were of similar age and body weight. However, the number of follicles (? 1 mm diam.) in the above F+ lambs was 1.5 fold greater (P<0.01) than that in the ++ lambs. In lambs of both genotypes, ovarian follicles were active in synthesising testosterone and oestradiol and of reaching diameters which were similar to those of preovulatory follicles in mature ewes. However, none of the ovaries showed evidence of recent ovulations. In Booroola ewes (4 to 8 years of age), the proportions of small ovarian follicles (0.5 to 1.0 mm diam.) that synthesised progesterone, androstenedione and oestradiol in culture were related (P<0.05) to genotype (homozygous, FF > F+ > ++ ewes). Also in the above ewes, follicles in the FF and F+ animals reached maturity at smaller diameters than in ++ animals, namely 3.4 ± 0.3, 4.1 ± 0.2 and 6.8 ± 0.3 mm (mean ± s.e.m.; n=3 ewes/genotype) respectively. During a clopreostenol-induced follicular phase, the oestradiol secretion rates from FF ewes with 4.8 ± 0.3 `oestrogenic` follicles, F+ ewes with 3.2 `oestrogenic` follicles and ++ ewes with 1.5 ± 0.02 such follicles were similar as were the mean total numbers of oestradiol-secreting (i.e., granulosa) cells from these follicles, that is 5.4 x 106 cells in each genotype. Collectively these findings show ... Mostrar Tudo |
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Palavras-Chave: |
Booroola; Cell numbers; Follicle size; Granuiosa cells. |
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Thesagro: |
Fisiologia; Ovário; Ovino; Reprodução. |
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Thesaurus Nal: |
Ewes; Lambs; Ovarian follicles; Reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02910naa a2200361 a 4500
001 1522270
005 2023-11-28
008 1986 bl uuuu u00u1 u #d
100 1 $aMcNATTY, K. P.
245 $aOvarian follicular development in Booroola ewe lambs and in highly fecun Booroola ewes.$h[electronic resource]
260 $c1986
520 $aAbstract: At 3 months of age, the ovaries of F+ Booroola lambs [i.e. those heterozygous for the fecundity (F)-gene] were lighter (P<0.01) than those of ++ Booroola lambs (i.e. those without the F-gene) which were of similar age and body weight. However, the number of follicles (? 1 mm diam.) in the above F+ lambs was 1.5 fold greater (P<0.01) than that in the ++ lambs. In lambs of both genotypes, ovarian follicles were active in synthesising testosterone and oestradiol and of reaching diameters which were similar to those of preovulatory follicles in mature ewes. However, none of the ovaries showed evidence of recent ovulations. In Booroola ewes (4 to 8 years of age), the proportions of small ovarian follicles (0.5 to 1.0 mm diam.) that synthesised progesterone, androstenedione and oestradiol in culture were related (P<0.05) to genotype (homozygous, FF > F+ > ++ ewes). Also in the above ewes, follicles in the FF and F+ animals reached maturity at smaller diameters than in ++ animals, namely 3.4 ± 0.3, 4.1 ± 0.2 and 6.8 ± 0.3 mm (mean ± s.e.m.; n=3 ewes/genotype) respectively. During a clopreostenol-induced follicular phase, the oestradiol secretion rates from FF ewes with 4.8 ± 0.3 `oestrogenic` follicles, F+ ewes with 3.2 `oestrogenic` follicles and ++ ewes with 1.5 ± 0.02 such follicles were similar as were the mean total numbers of oestradiol-secreting (i.e., granulosa) cells from these follicles, that is 5.4 x 106 cells in each genotype. Collectively these findings show that the Booroola F-gene is expressed in the ovaries of ewes before puberty and during the earliest stages of follicular development. Moreover, as follicles in Booroola ewes with the F-gene mature at smaller diameters, the maturation of 5 or more follicles in FF ewes and 3 to 4 such follicles in F+ ewes may be necessary to produce the same number of oestrogen-producing (i.e. granulosa) cells as that from 1 or 2 mature follicles in ++ ewes.
650 $aEwes
650 $aLambs
650 $aOvarian follicles
650 $aReproduction
650 $aSheep
650 $aFisiologia
650 $aOvário
650 $aOvino
650 $aReprodução
653 $aBooroola
653 $aCell numbers
653 $aFollicle size
653 $aGranuiosa cells
700 1 $aLUN, S.
700 1 $aHEATH, D.
700 1 $aHUDSON, N.
700 1 $aMcDIARWID, J.
700 1 $aBALL, P.
700 1 $aSMITH, P.
700 1 $aHENDERSON, K. M.
773 $tProceedings New Zealand Society Animal Production$gv. 46, p. 241-244, Jan. 1986.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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