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71508

CHARACTERISTICS OF LACTATION CURVE IN DAMASCUS GOATS IN JORDAN

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Last updated: 04 Jan 2025

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Abstract

Test day milk yield data on  Damascus goats maintained at Walla station belonging to ministry of agriculture in Jordan were collected over the period from 2002 to 2010 and included 7700 test days (1540 records). Wood model parameters were estimated using non-linear regression and individual curves were fitted. The characteristics of lactation curve were computed.  The initial yield (a), rate of increase (b) and rate of decline (c) parameters in Wood's model for Damascus goats were 1.12±0.002, 0.35±0.0003 and 0.08±0.00, respectively. The values of peak milk yield (PMY), peak week (PW) and persistency (PS) were 1.29±0.007 kg, 3.93±0.008 and 0.86±0.07, respectively. Heritability estimates were found to be low, being 0.09 ±0.01, 0.07 ±0.01, 0.08±0.01, 0.04 ±0.001 and 0.07±0.01 for a, b, c, PMY and PS, respectively. Repeatability estimates were 0.30, 0.21, 0.25, 0.13 and 0.21 for a, b, c, PMY and PS, respectively.  Positive genetic correlation between the parameter a and parameter b and c were 0.99 and 0.99, respectively. The genetic and phenotypic correlations between b and c were high significant (0.99 and 0.91, respectively). Negative genetic and phenotypic correlation between the parameter a and PS were -0.99 and -0.81, respectively. It is concluded that incomplete gamma function of Wood to Damascus goats milk yields was sufficient in describing lactation curve in Damascus goats.  

DOI

10.21608/jappmu.2013.71508

Keywords

Lactation curve, peak milk yield, persistency, Damascus goats

Authors

First Name

E.

Last Name

Ayasrah

MiddleName

M.

Affiliation

Animal Production Department, Faculty of Agriculture, Cairo Univ.

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Orcid

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First Name

S.

Last Name

Abou-Bakr

MiddleName

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Affiliation

Animal Production Department, Faculty of Agriculture, Cairo Univ.

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Orcid

-

First Name

M.

Last Name

Ibrahim

MiddleName

A. M.

Affiliation

Animal Production Department, Faculty of Agriculture, Cairo Univ.

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Volume

4

Article Issue

8

Related Issue

10819

Issue Date

2013-08-01

Receive Date

2020-02-17

Publish Date

2013-08-01

Page Start

479

Page End

491

Print ISSN

2090-3642

Online ISSN

2090-3723

Link

https://jappmu.journals.ekb.eg/article_71508.html

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https://jappmu.journals.ekb.eg/service?article_code=71508

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2

Type

Original Article

Type Code

876

Publication Type

Journal

Publication Title

Journal of Animal and Poultry Production

Publication Link

https://jappmu.journals.ekb.eg/

MainTitle

CHARACTERISTICS OF LACTATION CURVE IN DAMASCUS GOATS IN JORDAN

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Article

Created At

22 Jan 2023