Morfometria do oviduto de poedeiras comerciais semipesadas submetidas a diferentes métodos de muda forçada

An experiment was carried out to evaluate the performance, egg quality and morphometry of the reproductive tract, liver, pancreas and tongue of laying hens submitted to different molting methods. Two hundred and eighty eight 72-week-old Isa brown layers were distributed according to a completely randomized design with six treatments (molting methods) and six replicates of eight birds each. Layers were fed diets containing 3000 ppm zinc oxide, 60 ppm or 120 ppm nicarbazin, 30 ppm or 60 ppm salinomycin, or were submitted to feed fasting. Data were submitted to analysis of variance and means were compared by the test of Tukey at 5% probability level. Molting methods alternative to feed fasting were effective to induce molting in layer and provided good performance results in the second laying cycle.

Section: Use Of Nicarbazin Salinomycin and Zinc Oxide As Alternativementioning

confidence: 59%

Use of nicarbazin, salinomycin and zinc oxide as alternative molting methods for commercial laying hens

Domingues

Sgavioli

Praes

et al. 2014

“…Except for the quails submitted to the 25% BWL fasting, all results are consistent with El-Deek & Al-Harthi (2004), who, studying induced molting in hens, observed no difference in ovary weight, oviduct weight and length of hens fed 20,000 ppm zinc oxide in the feed, submitted to feed restriction, or submitted to fasting. Araújo et al (2006), analyzing the ovary and the oviduct on different days post-molting, concluded that reproductive system biometrics was not different in layers submitted to fasting or to the method of 20,000 ppm zinc oxide dietary inclusion. Quails molting by fasting at 25% BWL did not present satisfactory reduction of oviduct length, ovary weight, oviduct weight, and reproductive system weight parameters.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of induced molting methods on the livability and reproductive system regression of Japanese quails (Coturnix japonica)

Teixeira¹,

Cardoso²,

Nogueira³

et al. 2007

This study aimed at evaluating the alternative method of zinc oxide and fasting to induce molt in Japanese quails. A total number of 190 48-week-old quails was used. They were at end of laying cycle, and presented low egg production. Quails molted by zinc oxide (Z) were fed a diet containing 25,000 ppm of zinc oxide, and received water ad libitum. Quails treated by fasting (F) received no feed and a day of water restriction. The treatment period was determined by the experimental level of body weight loss (BWL). Birds were submitted to different levels of BWL in order to analyze reproductive system regression (ovary + oviduct), and livability. The following groups were established according to their BWL: Control (untreated quails); F25 (25% BWL by F); F35 (35% BWL by F); Z25 (25% BWL by Z), and Z35 (35% BWL by Z). Z25, Z35, and F35 presented no significant differences in reproductive system weights after molting; however, their weights were lower than F. Z, Z, and F presented the following livability: 97.5, 72.5, and 90%. Japanese quails treated by the alternative method of zinc oxide, presenting body weight loss of 25%, showed low mortality rate, and adequate regression of the reproductive organs

“…Similar results were observed by Berry & Brake (1991), who compared fasting to the dietary supply of 2,000 ppm zinc oxide as forced-molting method until 30% weight loss, and 1.18% oviduct weight relative to live weight when zinc oxide was used. One of the most important factors of induced molting is body weight loss, resulting in follicle development arrest and atresia (Araújo et al 2007), which will ensure optimal performance during the second laying cycle. Relative organ weights evaluated when hens were sacrificed after the post-molting period were not influenced by the treatments ( Table 5), showing that the amino acid levels supplied were sufficient to recover the weights of the reproductive organs, liver, and pancreas, thereby promoting good results during the second laying cycle.…”

Section: Lysine and Methionine + Cystine For Laying Hens During The Pmentioning

confidence: 99%

Lysine and methionine + cystine for laying hens during the post-molting phase

Domingues¹,

Sgavioli²,

Praes³

et al. 2012

One experiment was conducted to evaluate the effect of using different lysine and methionine + cystine levels on body weight recovery, performance, and egg quality of laying hens during the post-molting period. In this trial, 432 Isa Brown layers, with 72 weeks of age, were distributed in 54 cages according to a completely randomized design with six treatments and nine replicates of eight birds each. During the resting period, six diets with different digestible lysine and methionine + cystine levels were used, as follows: 0.48% digestible lysine and 0.43% methionine + cystine; 0.48% digestible lysine and 0.47% methionine + cystine; 0.48% digestible lysine and 0.52% methionine + cystine; 0.56% digestible lysine and 0.50% methionine + cystine; 0.56% digestible lysine and 0.56% methionine + cystine; 0.56% digestible lysine and 0.62% methionine + cystine. Data were submitted to analysis of variance and means were compared at by Tukey’s test at 5% probability level. The different lysine and methionine + cystine levels in the diets fed during the resting period significantly influenced layer performance. The diet containing 0.56% lysine and 0.56% methionine + cystine promoted higher egg weight eggs during the second production cycle