scholarly journals Milk Yield Traits of Brown Cows Reared at Malya State Farm and Effects of Some Environmental Factors on These Traits

Author(s):  
Süleyman ÇİLEK ◽  
Galip BAKIR
Author(s):  
Ahmet Derviş Sarar ◽  
İbrahim Tapkı

In this study, milk yield parameters of Holstein Friesian cows raised at Koçaş State Farm were investigated. The means of lactation milk yield, 305 d milk yield, lactation length and dry period were found as 7046.18 kg, 6588.38 kg, 327.37 d and 67.48 d respectively. Also, estimated heritability’s of same traits were as 0.25, 0.26, 0.07 and 0.03 respectively. The effects of year, season and lactation number on lactation milk yield, 305 d milk yield and lactation length; the effects of calving season and lactation number on dry period were found significantly. In conclusion, data of milk yield traits of Holstein Friesian cows in raised Koçaş State Farm herd were determined well condition within reasonable ranges.


1999 ◽  
Vol 82 (4) ◽  
pp. 788-794 ◽  
Author(s):  
N. Vukasinovic ◽  
S.K. Denise ◽  
A.E. Freeman

Genetics ◽  
2008 ◽  
Vol 179 (3) ◽  
pp. 1539-1546 ◽  
Author(s):  
Marie Lillehammer ◽  
Mike E. Goddard ◽  
Heidi Nilsen ◽  
Erling Sehested ◽  
Hanne Gro Olsen ◽  
...  

2021 ◽  
Author(s):  
Mahesh Shivanand Dige ◽  
P. K. Rout ◽  
S. Bhusan ◽  
G. R. Gowane

Abstract This study aims to evaluate the genetic potential of the Jamunapari goat and formulate a new selection strategy for improving the lactation traits. The data set included 4049 phenotypic records for lifetime milk yield at 90 days (MY90) and 140 days (MY140), total milk yield (TMY), and lactation length (LL) obtained from the progeny of 83 sires and 1643 dams between 1990 and 2019. Animal model employing average information restricted maximum likelihood (AIREML) was used to estimate genetic parameters for milk yield traits and LL. The direct additive heritability estimates for lifetime lactation traits, that used repeatability model were 0.10 ± 0.03, 0.08 ± 0.03 and 0.12 ± 0.02 for MY90, MY140 and TMY, respectively, while it was low for LL (0.06 ± 0.02). The repeatability estimates were moderate ranging from 0.17 to 0.22 for milk yield traits and LL, indicating persistent performance over the parities. Animal permanent environment influence (c2) was significant in milk yield attributes, whereas additive maternal genetic effects were absent. As the early selection criteria based on first parity records is essential, we analysed the data for the first parity separately and obtained moderate h2 estimates viz. 0.26 ± 0.05, 0.26 ± 0.06 and 0.25 ± 0.06 for MY90, MY140 and TMY, respectively. These estimates augurs further positive scope of selection in Jamunapari goats for higher milk yield. High and positive genetic correlation of MY90 with MY140 (0.97 ± 0.01) and TMY (0.91 ± 0.05) revealed the scope of using MY90 as the selection criterion.Based on these results, we recommend use of MY90 as a single trait selection criterion for genetic improvement of all lactation traits in Jamunapari goat.


Animals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 520
Author(s):  
Lizbeth E. Robles Jimenez ◽  
Juan C. Angeles Hernandez ◽  
Carlos Palacios ◽  
José A. Abecia ◽  
Anna Naranjo ◽  
...  

The objective of the present study was to evaluate the effect of the grade of crossbreeding (Lacaune x Manchega) and environmental factors on milk production in a commercial flock in Spain. A total of 5769 milk production records of sheep with different degrees of purity of the Lacaune breed crossed with Manchega were used as follows: 100% Lacaune (n = 2960), 7/8 Lacaune (n = 502), 13/16 Lacaune (n = 306), 3/4 (n = 1288), 5/8 Lacaune (n = 441) and 1/2 Lacaune: Manchega (n = 272). Additional available information included the number of parity (1 to 8), litter size (single or multiple), and the season of the year of lambing (spring, summer, autumn and winter). A mixed model was used to evaluate the level of crossbreeding and environmental factors on milk production. The 100% Lacaune sheep presented the highest milk production with respect to the F1 Lacaune x Manchega sheep (p < 0.01), showing that as the degree of gene absorption increases with the Manchega breed, it presents lower milk yield. The 100%, 13/16, and 3/4 Lacaune genotypes had the highest milk yields with respect to the 1/2 Lacaune/Manchega breed (p < 0.001). The Lacaune registered on average 181.1 L in a period adjusted to 160 days of lactation (1.13 L/ day). Likewise, the parity number, litter size, and season of lambing effects showed significant differences (p < 0.01). It was concluded that 13/16 and 3/4 Lacaune/Manchega ewes presented the highest milk yields with respect to the other crosses.


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