Environmental and genetic effects on udder characteristics and milk production in Damascus goats

Charallah

et al. 2018

Acta Sci. Anim. Sci.

This research aims to assess the performances of lactating Bedouin goat under arid conditions, focusing on the relationship of milk yield with body and udder morphology and growth traits. Fourteen goats and their kids were followed during early lactation (90 days post-partum). Mean daily milk yield was 0.56 kg. Milk fat, proteins, lactose, solids non-fat and minerals were respectively 34.9, 38.9, 48.8, 107 and 6.7 g L-1. Mean kids’ birth weight, adjusted body weight at 90 days of age and average daily gain were respectively 2 kg, 6.6 kg and 51.4 g day-1. Daily milk yield was correlated with goats’ body weight, withers height, rump height, udder width and udder circumference but not with linear udder score and growth performances. These results provide important data about the milk production of Bedouin goat emphasizing its correlation with body and udder morphological traits which can help to elaborate a specific breeding program for this breed.

Section: Discussionsupporting

confidence: 86%

Milk production and its relationship with milk composition, body and udder morphological traits in Bedouin goat reared under arid conditions

Charallah

et al. 2018

Acta Sci. Anim. Sci.

“…While these findings were lower than those recorded earlier in Shami does bred in Erbil, Northern Iraq (Hermiz et al, 2015). Also TMY recorded in this study is lower than that of Damascus goat (214 kg) found by Mavrogenis et al (1989) and that of native black does (136.78 kg) raised in Sulaimani -Northern of Iraq (Maarof et al, 2009). Such variation can be characteristic to a mixture of animal performance influencing genetic and environmental factors.…”

Section: Resultscontrasting

confidence: 65%

Non Genetec Parameters and Repeatability for Milk Traits Goat in Northern Iraq

Baper

Hermiz

2019

SJUOZ

A total of 439, 436 and 437 records of average daily milk yield (ADMY), milk yield after weaning (MYAW) and total milk yield (TMY) respectively were analyzed. Data used in this study obtained from mountain does at private project in Raselain Village/ Akre Region/ Duhok governorate. The data related to two milking seasons (2016-2017) and (2017-2018). The animals were allowed to graze natural pasture and stubble, straw and ground oak acorns were providing whenever required. Does were flushed 2 weeks prior to mating and kidding season. The flock was placed on a regular health program. Does were milked by hand at biweekly intervals starting from the first week post kidding till the does are dried off. ADMY was calculated by multiplying test day milk yield * 2. While TMY calculated by multiplying ADMY by lactation period. Statistical analysis of data was carried out by using GLM procedure within SAS programme. This model includes effects of doe's age, year and season of kidding, birth's type and sex and weight of doe at kidding on milk traits. Effect of doe added to above model as a random effect to estimate their repeatability using Restricted Maximum Likelihood method. Overall means for ADMY, MYAW and TMY were 0.727, 54.49 and 129.32 kg respectively. Results showed that the age of does had significantly higher effect (P< 0.01) on all studied traits of milk. Does aged 4.5 years produce significantly higher ADMY (0.772 kg), and accordingly TMY (136.88kg), while higher MYAW recorded for does aged 3.5 years beside 4.5 years. The effectiveness of year was significant (P< 0.01) on all milk yield traits. Also season of kidding affect all studied milk traits significantly (P< 0.01), whereas the does kidding in winter had significantly higher ADMY, MYAW and TMY than those kidding in spring season. The effects of type of birth and sex of kids were significant on all milk traits. Does with female twins produced significantly more ADMY comparing with does having male or female singles only. Does with female twins and male and female twins produced significantly much MYAW. Does with female twins yield significantly higher TMY when compared to those in the other groups, on the same time there were no significant differences in TMY of does with male twin and does with male and female twin. There was no significant effect of doe weight at kidding on all studied traits and the regression coefficients were positive for ADMY (0.0003 kg/kg), and TMY (0.085 kg/kg) while the regression was negative for MYAW (- 0.0024 kg/kg). Repeatability estimates of ADMY, MYAW and TMY were 0.24, 0.31 and 0.27 respectively. It sum: due to the effectiveness of the fixed factors on the studied traits, hence adjusting records is necessary. The estimates of repeatability indicate that selection of does as well their kids depending on their milk production will improve the productivity in the next year.

Rev. Elev. Med. Vet. Pays Trop.

“…Les durées de lactation inférieures à trois mois ont représenté 13,4 p. 100 des cas, celles comprises entre trois et cinq mois 57,6 p. 100, et celles supérieures à neuf mois 16 p. 100 (figure 8). Cette durée de lactation a été plus courte que celle de 150 jours observée chez les chèvres de la même race (4) et chez les races laitières spécialisées (15). (14).…”

Section: Durée De Lactationunclassified

Performances de reproduction et de production laitière des chèvres Draa au Maroc

Boujenane¹,

Lichir²,

Hazzab³

2010

Le principal objectif de cette étude a été une contribution à la connaissance des chèvres de race Draa. L’étude a porté sur l’analyse des performances de reproduction et de production laitière des chèvres Draa de la station de Skoura entre 1989 et 2001. L’âge à la première mise bas a été en moyenne de 25,5 mois. La durée de gravidité moyenne a été de 153 jours. L’intervalle entre deux mises bas et l’intervalle mise bas - saillie fécondante ont été respectivement de 157 et 206 jours. La durée de lactation a été de 133 jours. La production laitière a été de 0,46 kg par jour et de 61,3 kg par lactation totale. Il a été conclu qu’il serait intéressant d’exploiter la variabilité génétique qui existe au sein de la race à des fins de sélection.