Modeling the growth curve in Kordi sheep: The comparison of non-linear models and estimation of genetic parameters for the growth curve traits

Mohammadi, Yahya; Mokhtari, M.S.; Saghi, Davoud Ali; Shahdadi, Ali Reza

doi:10.1016/j.smallrumres.2019.06.012

Cited by 29 publications

(17 citation statements)

References 17 publications

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“…The higher asymptotic weight in males compared to females imply possible evidences on the impact of sexual dimorphism on weight gain. The male lambs had higher estimated mature weight than female lambs, which may be explained by slower maturity rate [ 39 ]. Similar phenomenon in male lambs were found in Kordi [ 39 ], Mehraban [ 40 ], Shall [ 41 ], and Hemsin [ 42 ] sheep breeds.…”

Section: Discussionmentioning

confidence: 99%

“…The male lambs had higher estimated mature weight than female lambs, which may be explained by slower maturity rate [ 39 ]. Similar phenomenon in male lambs were found in Kordi [ 39 ], Mehraban [ 40 ], Shall [ 41 ], and Hemsin [ 42 ] sheep breeds. The integration constant (B) did not show any clear interpretation, as mentioned by Malhado et al (2009) [ 43 ].…”

Section: Discussionmentioning

confidence: 99%

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Farming systems in sheep rearing: Impact on growth and reproductive performance, nutrient digestibility, disease incidence and heat stress indices

et al. 2021

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The experiment was conducted with an intent to know the effect of different farming systems on the growth performance, nutrient digestibility coefficients, reproductive traits, disease incidence, heat stress indices, and cost economics of Nellore sheep. The study includes two parallel trials to prevent the influence of age on heat stress indices (panting score and erythrocyte osmotic fragility (EOF)). One hundred and twenty lambs (60 ram-lambs and 60 ewe-lambs) were allotted in a randomized block design under extensive, semi-intensive, and intensive systems for trial I, whereas trial II include eighteen rams assigned to the three respective farming systems in a completely randomised design. Both, season (summer) and grazing practice increased the panting score and EOF. The heat stress indices were positively correlated (P<0.01) with dry-bulb temperature and temperature-humidity index (THI) and inversely correlated (P<0.01) to relative humidity. Allotting the sheep to intensive system increased (P<0.001) weight gain and average daily gain with higher effect in males compared to females. The parameters of asymptotic weight (A), integration constant (B), and maturation rate were higher for intensive males. The male Nellore lambs had higher asymptotic weight and lower maturity rate than females, irrespective of the rearing system. Intensive sheep revealed a higher dry matter intake, digestibility coefficients, feed conversion ratio. The instantaneous bite mass (IBM) was higher for Commelina benghalensis, while instantaneous bite frequency (IBF), instantaneous intake rate (IIR) were higher for Cyanodon dactylon and amaranthus viridis, respectively. The proportion of intakes were highest for Stylo hemata followed by Cynodon dactylon and Tridax procumbens species. No differences were observed for the weight at puberty, oestrus cycle length, oestrus duration, conception percent, gestation period, and lambing percent in three rearing systems; however, the age at puberty was lower (P<0.001) and the birth weight was higher (P<0.001) for sheep reared under intensive farming system. Highest disease incidence was observed in rainy and winter seasons, particularly in sheep reared under extensive system. The capital expenditure was same for the three rearing systems, while the recurring expenditure was higher for Intensive farming system. The gross income and net income were higher for intensive system on account of higher weight gains. However, the higher returns per rupee of expenditure project the extensive farming as an ideal rearing system for small farmers and entrepreneurs with a low initial capital.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Farming systems in sheep rearing: Impact on growth and reproductive performance, nutrient digestibility, disease incidence and heat stress indices

et al. 2021

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“…For the sheep, S01 were Awassi from Turkey ( Bilgin et al., 2004 ), S02-S06 Baluchi from Pakistan and Turkey ( Iqbal et al., 2019 ; Tariq et al., 2013 ), S07 Blackbelly from Mexico (Jimenez-Severiano et al., 2010 ), S08 Daglic from Turkey ( Akbas, Taskin, & Demirören, 1999 ), S09 Deccani from India ( Bangar, Lawar, Nimase & Nimbalkar, 2018 ), S10 Dorper from Brazil ( Malhado, Carneiro, Affonso, Souza & Sarmento, 2009 ), S11-S12 Hemsin from Turkey ( Kopuzlu, Sezgin, Esenbuga & Bilgin, 2014 ), S13-S14 Ile-de France from Brazil ( Falcao et al, 2015 ; Moreira et al., 2016 ), S15 Karachai from Russia (Semyonov & Selkin, 1989 ), S16-S17 Karagouniko from Greece ( Goliomytis, Orfanos, Panopoulou & Rogdakis, 2006 ; Teleken et al., 2017 ), S18-S34 different varieties and crossbreds of colored and white Karaman from Turkey ( Aytekin, Zulkadir, Keskin & Boztepe, 2010 ; Bilgin et al., 2004 ; Daskiran, Koncagul & Bingol, 2010 ; Gökda, Ulker, Karakuş, & Firat, 2006 ; Keskin, Dağ, Sariyel & Gökmen, 2009 ; Kucuk & Eyduran, 2009 ; Kum, Karakus & Ozdemir, 2010 ), S35 Kivircik from Turkey ( Abbas et al., 1999 ), S36 Kordi from Iran ( Mohammadi, Mokhtari, Saghi & Shahdadi, 2019 ), S37 Mehraban from Iran (Bathaei & Leroy, 1998 ), S38 Morada Nova from Brazil ( Paz et al., 2018 ), S39-S40 Ouled Djellal from Algeria ( Zidane, Niar & Ababou, 2015 ), S41-S42 Romney from New Zealand ( Hancock, Oliver, McLean, Jaquiery & Bloomfield, 2011 ), S43-S45 Santa Ines from Brazil ( Santos et al., 2014 ; Sarmento et al., 2006 ; Silva et al., 2012 ), S46-S47 Scottish Blackface from the UK ( Friggens, Shanks, Kyriazakis, Oldham & McClelland, 1997 ), S48-S49 Segurena from Spain Lupi, Nogales, León, Barba Capote and Delgado, (2015) , S50-S51 Shetland from the UK ( Friggens et al., 1997 ), S52 Sonadi from India ( Gautam, Kumar, Waiz & Nagda, 2018 ), S53-S54 Spanish Merino from Spain ( …”

Section: Methodsmentioning

confidence: 99%

The growth of domestic goats and sheep: A meta study with Bertalanffy-Pütter models

Brunner

Kühleitner

2020

Veterinary and Animal Science

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Highlights We studied 122 mass-at-age data for goats, sheep, and wildlife. We used Bertalanffy-Pütter models to obtain better fitting growth curves. The Brody model had an acceptable fit to 70% of the data. For 39% of data the best-fitting BP-model had a discernable inflection-point. For these models, maximal weight gain per day was 55% higher than natal weight gain.

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“…Other authors concluded that the Gompertz model was the one that best described the growth of Thalli, Rahmani and Morada Nova sheep breeds (Waheed et al, 2016;Rashad et al, 2017;Paro de Paz et al, 2018). In addition, studies conducted by Hojjati and Hossein-Zadeh (2018), Ali et al (2020), Bangar et al (2018), Mohammadi et al (2019), and Hossein-Zadeh and Golshani (2016) found that the Brody and Richards models were the best non-linear functions to describe the growth of Deccani, Mehraban, Kordi, Kajli and Iranian Guilan sheep, respectively. However, these models did not show convergence in the present study.…”

Section: Resultsmentioning

confidence: 99%

Early Growth Model of Pelibuey Lambs Raised Under an Intensive Production System in Colima, Mexico

Macedo¹,

Arredondo²,

Jiménez³

et al. 2021

Chil. j. agric. anim. sci.

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The aim of this study was to describe the early growth of Pelibuey lambs raised under an intensive production system in Colima, Mexico, using non-linear models. Weight data were collected from 433 lambs every 30 days from birth to 180 days of age, and growth curves were estimated using non-linear and linear models. According to goodness of fit criteria, the Linear, Gompertz, Logistic and Von Bertalanffy models are suitable and show a reasonable fit for describing Pelibuey lamb's growth, the Brody and Richards curves did not meet the convergence criterion. The parameter A denotes asymptotic weight; weight was higher in multiple born males and quadruplet born females in the Von Bertalanffy and Gompertz models, while it was also higher in males in the Logistic model. The parameter k represents maturation rate and indicates the growth speed in reaching asymptotic weight, being higher in single and twin females, and single males in all the non-linear models. From birth up to 90 days of age (weaning), weight of single lambs becomes greater than that of multiple born lambs, but from 90 days of age, weight of multiple born lambs tends to equal that of singles, which happens at 180 days of age. The early growth of Pelibuey lambs can be described with similar precision using linear and non-linear models.

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Modeling the growth curve in Kordi sheep: The comparison of non-linear models and estimation of genetic parameters for the growth curve traits

Cited by 29 publications

References 17 publications

Farming systems in sheep rearing: Impact on growth and reproductive performance, nutrient digestibility, disease incidence and heat stress indices

Farming systems in sheep rearing: Impact on growth and reproductive performance, nutrient digestibility, disease incidence and heat stress indices

The growth of domestic goats and sheep: A meta study with Bertalanffy-Pütter models

Early Growth Model of Pelibuey Lambs Raised Under an Intensive Production System in Colima, Mexico

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