The Effect of Neuspora sitophila Fungi on Chemical Composition, Digestibility and Degradability of Sugar Beet Pulp
Masoud
Dashti Saridorgh
author
Yousef
Ruzbehan
author
SeyedAbbas
Shojaosadati
author
text
article
2010
per
Chemical composition, in vitro digestibility and in situ (dry matter and protein) degradability were measured to assess the nutritive value of Sugar Beet Pulp (SBP) treated with Neuspora sitophila fungi. The obtained data were compared using t test. Dry Matter (DM), Crude Protein (CP), Neutral Detergent Fiber (NDF), Acid Detergent Fiber (ADF) and ash content for untreated SBP were 90, 9.2, 46.6, 30.0 and 5.6 % of DM, respectively, and they after processed by fungi, were respectively 78, 25.6, 27.2, 25.4 and 6.3% of the DM. Treated SBP contained being a lower content of DM, NDF and ADF, but higher CP (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20927_94c985f37cf312ffadd01005d7718882.pdf
Genetic Relationships between Linear Type Traits, Milk Yield and Open Day in Holstein Cows of Iran
MohammadReza
BakhtiariZadeh
author
Mohammad
Moradi ShahreBabak
author
Abbas
Pakdel
author
Ahmad
Moghimi
author
text
article
2010
per
The objective of the present study was to estimate the relationship between genetic parameters for 13 linear type traits, and milk yield as well as open day in Holstein cattle of Iran. Three data sets of: 16502 (type traits), 16557 (milk yield) and 11631 (open days) records related to the first calving of the cows, and respectively taken from 1500, 1566, and 2000 herd-year-season groups, were taken into account. SAS software and Proc GLM were employed to fit the model. Genetic parameters were estimated using Restricted Maximum Likelihood along with an animal model and ASREML software. Genetic correlation among type traits and milk production ranged from 0.34 (rear udder width) to -0.31 (udder depth), and among type traits and fertility, it ranged from 0.62 (rear udder width) to -0.37 (udder depth). Most of the genetic correlations between milk production and fertility indicate that more production in cows was accompanied by a lower fertility, while cows with a lower production level benefitted from a more fertility rate.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20928_4c55c3bf6e05bbb6f8ec37b66b858145.pdf
An Evaluation the Feeding Value of Date Pits in Broiler Chickens
Mojtaba
Zaghari
author
MohammadMehdi
Ghasemi
author
Mahmoud
Shivazad
author
Ardeshir
SheykhAhmadi
author
text
article
2010
per
An experiment was conducted to evaluate the feeding value of date pits in broiler chickens. One hundred sixty eight male broiler chicks (Ross 308) from 1 to 42 days of age were used. Experimental design was CRD, in a factorial arrangement of 4 replicates per treatment. The factors included: 3 levels of date pits (10, 20 and 30%) either with or without multi enzyme supplementation. A control diet based on corn and soybean meal was included. All diets were isonitrogenous as well as isoenergetic. Apparent metabolizable energy corrected for zero nitrogen retention and amino acids content of date pits were assessed before formulation of the diets. Cage body weight and feed intake were measured at 10, 28 and 42 days of age. At the end of the experiment, two birds from each cage were selected for either blood plasma samples to be used to measure lipid metabolites and peroxidation parameters. Finally, following over night fasting, birds were slaughtered and carcass characteristics evaluated. Results indicated that live body weight at 10, 28 and 42 days of age, weren’t affected by either the levels of dietary date pits or enzyme addition and neither by the interaction between the two factors (P>0.05). Adding date pits to broiler diet, up to 10% improved feed conversion ratio (FCR) significantly (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20929_6ff3cf3a462830878efb7a91c09efa65.pdf
The Effect of Peptide Nitrogen Source on Nutrients Digestibility, Ruminal Fermentation Pattern and Microbial Nitrogen Synthesis in Late Lactating Dairy Cows
Mehdi
Kazemi Benchenari
author
Kamran
RezaYazdi
author
Ali
Nikkhah
author
Hamid
Kohram
author
Mehdi
Dehghan Banadaki
author
MohammadReza
Emami
author
text
article
2010
per
This experiment was conducted to study the effects of Peptide Nitrogen Source (PNS) infusion on ruminal fermentation pattern, nutrient digestibility, and microbial nitrogen production. Three ruminally cannulated Holstein dairy cows BW=682 kg and DIM=210d were assigned in a 3×3 Latin Square of 21-d periods. The first 14 d’s were considered as adaptation period and the last 7 d as sample collection period. Three levels of sodium caseinate as PNS were used in the experiment (0, 50 and 100gr/d considered as diets 1, 2 and 3 respectively). PNS was infused directly into rumen of the fistulated cows just before the offer of morning diet. Purine derivatives method was ebpolyed for daily microbial nitrogen synthesis estimation. Ruminal Ammonia Nitrogen (NH3-N) and Peptide Nitrogen (Pep-N) concentrations (P
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20930_0c102b3df38fd42b59cecda5a07cb414.pdf
Study of the Effect of Autoselection on Heritability and Selection Response in Reproductive Traits
Masoud
ShirAli
author
Hasan
MehrabaniYeganeh
author
text
article
2010
per
Autoselection is a kind of natural selection, that occurs in reproductive traits by inequality of offspring generation and therefore by virtue of the nature of its genes transmission to next generations. In this study, the effects of autoselection on heritability and selection response in reproductive traits by using univariate stochastic computer simulation in artificial selected and unselected populations were investigated. The results showed that, in autoselection and no artificial selection on litter size, additive genetic mean, phenotypic mean and threshold mean increased. Additive genetic variance and heritability had no changes. In autoselection and artificial selection for threshold phenotype on dams and in autoselection and artificial selection for threshold phenotype on dams and for sires base on their mother’s threshold phenotype, the results showed that in high heritability, observed selection response for per generations was more than last generation because with increasing threshold mean, the distribution of threshold phenotype in dam’s population and autoselection response depends to this distribution. Although, autoselection and artificial selection occurred additive genetic variance and heritability had decreased a little, because artificial selection base on threshold phenotype and autoselection prevent to decrease additive genetic variance. Analysis of threshold phenotypic data by MATVEC with threshold model, showed that estimated heritability was less than real underlying heritability and its estimation depends on real underlying heritability, proportion selected and paths of selection.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20931_5e591324fa07b5e1ee30180e8337aa05.pdf
An Estimation of Genetic Parameters for some Reproductive Traits and their Relationships to Milk Yield in Iranian Holstein Cattle
Ayatollah
Chookani
author
Mohammad
Dadpasand
author
HamidReza
Mirzaei
author
Mohammad
Rokouii
author
MohammadBagher
SayadNezhad
author
text
article
2010
per
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20932_3b67b93462f705343fecaa2b7e77e758.pdf
Estimation of Genetic Parameters of Economically Important Traits in Native Fowl, Yazd Province
Hakimeh
EmamGholi Begli
author
Saeed
Zereh Daran
author
Saeed
Hasani
author
MokhtarAli
Abbasi
author
text
article
2010
per
Data related to Yazd native fowls (obtained during 2000-2008) Yazd native fowls were made use of in the present study. The investigated traits consisted of Body Weight at 8 (BW8) and 12 weeks (BW12), Age at Sexual Maturity (ASM), Egg Number during the first three months of production period (EN) and the mean Egg Weight at 28, 30 and 32 weeks of age (EW). The genetic and phenotypic parameters were assessed through univariate as well as bivariate animal model employing ASREML software. The heritability estimates for BW8, BW12, ASM, EN and EW were 0.32± 0.01, 0.37±0.018, 0.21±0.02, 0.14±0.02 and 0.24±0.02, respectively. The respective genetic correlations of BW8 and BW12 with ASM were -0.21±0.05 and -0.28±0.05. Also, the respective genetic correlations of ASM with EN and EW were -0.95±0.017 and 0.29±0.07. The genetic trends during the 6 generations of selection were estimated using regression coefficients of breeding values on generation. Genetic trends of BW8, BW12, ASM, EN and EW were 9.55 gr, 15.35 gr, -0.03 day, 0.031 egg and 0.037 gr. The results of current study indicate that reducing the age at sexual maturity will would lead to an increase in the number of produced eggs.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20933_5ae045f926a218d2174c551b277e0a64.pdf
Hyperbolastic vs. Classic Model to Estimate Male Broiler Chicken Growth
Mohsen
Nikkhah
author
Majid
MotaghiTalab
author
Mohsen
Zavareh
author
text
article
2010
per
Such classical growth models as Gompertz and Richards have been extensively used in broiler studies. This study was conducted to explore if 3 types of Hyperbolastic growth models known as H1 (generalized from logistic growth model), H2 (stand alone) and H3 (generalized from Wei¬¬bull growth model) may be empolyed to illustrate dynamic growth response of broilers and also how effective such models would be as compared with the classical growth models. A set of growth data were provided from 92 male broiler chicks reared from 1 to 56 days. Goodness of fit for individual growth model was determined using R2, MSE, RSD and Bias. The results of the present study indicate that, H3 could give a better fit (R2=0.99993) presumably due to its greater flexibility. In addition, H3 showed a higher accuracy and lower error (MSE= 264, RSD=16, Bias=0.5) than the other models, being followed by WeiBull, Gompertz, Richards H2 and H1 growth models, respectively. In the meantime, Logistic growth model appeared with the lowest accuracy (0.99898) and a highest error (3432). A general evaluation in this study revealed that H3 can be considered as a useful tool to fit broiler growth dataset, with the highest accuracy and a lowest error than the other growth models.
Iranian Journal of animal Science
پردیس کشاورزی و منابع طبیعی دانشگاه تهران
2008-4773
40
v.
4
no.
2010
https://ijas.ut.ac.ir/article_20934_d9c32a541aecb16a52853c456438e169.pdf