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| Registros recuperados: 12 | |
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| Silva, Waldirene Rossi da; UEM; Scapinello, Cláudio; UEM; Moraes, Gentil Vanini de; UEM; Martins, Elias Nunes; UEM; Faria, Haroldo Garcia de; UEM; Ferreira, Walter Motta; UFMG. |
| Foram utilizadas 240 ninhadas oriundas de 80 matrizes NZB, nulíparas, durante três ciclos reprodutivos, submetidas a um ritmo de reprodução de 42 dias, distribuídas em um delineamento inteiramente casualizado, em esquema fatorial 2 x 2 x 3 (2.600 e 2.800 kcal ED kg-1 de ração versus desmama aos 28 e 35 dias versus três ciclos reprodutivos). O nível de ED nas rações não afetou o peso das matrizes na desmama de seus láparos e as taxas de fertilidade, independente do ciclo reprodutivo. A melhor condição corporal nos três ciclos das matrizes que desmamaram seus láparos aos 28 dias, permitiu taxas de fertilidade mais altas durante todo o período experimental. À exceção do tamanho da ninhada ao nascer, que foi menor no primeiro parto, o tamanho da ninhada aos 21... |
| Tipo: Pesquisa de campo |
Palavras-chave: Produção Animal; Nutrição de não-ruminantes desempenho de láparos; Tamanho da ninhada; Condição corporal da matriz; Taxa de mortalidade; Fertilidade 5.04.05.00-4 litter performance; Litter size; Corporal condition of does; Mortality; Fertility. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6619 |
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| Miranda-Furtado,Cristiana Libardi; Silva,Priscila Vendramini; Guimarães,Marta Fonseca Martins; Serão,Nicola Vergara Lopes; Guimarães,José Domingos; Guimarães,Simone Eliza Facioni. |
| The main purpose of the present study was to identify for candidate genes related to ovulation in swines. To do so, it was investigated in ovarian follicular cells through quantitative real-time PCR the differential expression of the following genes: steroidogenic acute regulator (STAR), GATA-binding protein 4 (GATA), prostaglandin F2α (PGF2α), progesterone receptor (P4R), follicle-stimulating hormone receptor (FSHR), and cytochrome P450 aromatase (CYP19). These genes encode hormone receptors (FSHR and P4R), hormone (PGF2α), steroidogenic proteins (STAR and CYP19) and transcription factor (GATA). Folicular cells were collected from sows with high and low number of piglets/litters during the follicular phase of the estrus cycle. There was difference in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Candidate gene; Litter size; Ovulation rate; Pig production; Quantitative real-time PCR. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000500012 |
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| RAMÍREZ-BAUTISTA,AURELIO; PAVÓN,NUMA P. |
| It is well known that geographic variation oceurs in life history characteristics among populations of lizards. Variations in life histories found in some studies are possibly adaptations to environmental pressures. In southwestern México, the reproductive characteristics of the endemic species Sceloporus formosus have been poorly studied throughout its geographic range. We used specimens from scientific collections to describe male and female reproductive eyeles and sexual dimorphism of S. formosus. Other viviparous Sceloporus from high elevations show sexual dimorphism, with males being larger in many morphological characteristics than females. We therefore expected that S. formosus would show sexual dimorphism. However, we found no sexual dimorphism.... |
| Tipo: Journal article |
Palavras-chave: Litter size; Reproductive eyeles; Reproductive strategy; Tropical lizards. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000400009 |
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| Poduschka, Walter. |
| In a comparison of basic reproductive variables (number of teats, litter size, and duration of pregnancy) in the Madagascan Tenrecinae, some striking features (hyperthelia, litter size) are observed in Tenrec ecaudatus Lacépède, 1799 and the genus Hemicentetes Mivart, 1871. These variations are compared to Setifer setosus Froriep, 1806 and Echinops telfairi Martin, 1838. Tenrec ecaudatus gives birth to litters at intervals shorter than what was once believed to be the duration of pregnancy. This could be due either to superfetation, or to giving birth to one litter in two or more installments. The longitudinal stripe pattern of the genus Hemicentetes is interpreted as a mimicry of the sympatric, equally striped, juvenile Tenrec ecaudatus. The latter... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Insectivora; Tenrecidae; Hyperthelia; Reproduction; Litter size; Pregnancy; Mimicry. |
| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/504596 |
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| Barbosa,L.; Lopes,P.S.; Regazzi,A.J.; Guimarães,S.E.F.; Torres,R.A.. |
| Using principal component analysis, records of 435 animals from an F2 swine population were used to identity independent and informative variables of economically important performance. The following performance traits were recorded: litter size at birth (BL), litter size at weaning (WL), teat number (TN), birth weight (BW), weight at 21 (W21), 42 (W42), 63 (W63) and 77 (W77) days of age, average daily gain (ADG), feed intake (FI) and feed:gain ratio (FGR) from 77 to 105 days of age. Six principal components expressed variation lower than 0.7 (eigen values lower than 0.7) suggesting that six variables could be discarded with little information loss. The discarded variables present significant simple linear correlation with the retained variables. Retaining... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Swine; Multivariate analysis; Correlation; Discard; Growth; Litter size; Performance. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352005000600016 |
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| Ross,LK. |
| The following notes on gestation periods and litter size in seven specimens of Leiurus quinquestriatus are presented as observational data. Specimens of Leiurus quinquestriatus from southern Egypt and southern Israel were mated in the laboratory during 2007; afterwards, gestation periods and litter sizes of all females were recorded. Previous studies on this species reported that the gestation period ranged from 150 to 155 days and that litter size was between 12 and 99 offspring. In the present study, gestation periods in specimens from both geographic regions varied from 155 to 227 days and litter sizes were between 35 and 87 offspring. The current contribution expands on previously published data on gestation periods and supports previously reported... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Scorpions; Buthidae; Leiurus quinquestriatus; Gestation period; Litter size. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992009000200015 |
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| Runami,Iori; Gunji,Yousuke; Hishinuma,Mitsugu; Nagano,Masashi; Takada,Tatsuyuki; Higaki,Shogo. |
| We describe the reproductive biology of the coypu, Myocastor coypus (Molina, 1782), in western Japan, as an attempt to contribute to an efficient population control program of the coypu population. A total of 212 specimens (113 males and 99 females) were collected in the Tottori prefecture from February 2010 to January 2012. From the age estimation based on body weight and molar eruption pattern, we determined that both males and females reach sexual maturity at 4-6 months of age. Of the 72 mature females examined, 60 (83.3%) were pregnant, with a mean litter size of 6.5 ± 2.4 (mean ± SE). The onset of sexual maturity in the western Japanese population was relatively earlier when compared with indigenous and other introduced populations. Furthermore, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Litter size; Pregnancy rate; Sexual maturity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200002 |
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| Zhang,Chunyan; Liu,Yun; Huang,Kunkun; Zeng,Wenbing; Xu,Deqing; Wen,Qunying; Yang,Liguo. |
| Two active mutations (A 781 G and A 1575 G) in growth hormone (GH) gene, and their associations with litter size (LS), were investigated in both a high prolificacy (Matou, n = 182) and a low prolificacy breed (Boer, n = 352) by using the PCR-RFLP method. Superovulation experiments were designed in 57 dams, in order to evaluate the effect of different genotypes of the GH gene on superovulation response. Two genotypes (AA and AB, CC and CD) in each mutation were detected in these two goat breeds. Neither BB nor DD homozygous genotypes were observed. The genotypic frequencies of AB and CC were significantly higher than those of AA and CD. In the third parity, Matou dams with AB or CC genotypes had significantly larger litter sizes than those with AA and CD (p... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: DNA polymorphism; Growth hormone (GH) gene; Litter size; Superovulation response; Goat. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100010 |
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| Registros recuperados: 12 | |
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