Factors affecting milk production in Improved Awassi dairy ewes

2000 ◽  
Vol 71 (3) ◽  
pp. 607-615 ◽  
Author(s):  
E. Gootwine ◽  
G. E. Pollott
Keyword(s):  
Milk Production ◽  
Litter Size ◽  
Milk Yield ◽  
Intensive Management ◽  
Short Term ◽  
Artificial Rearing ◽  
Factors Affecting ◽  
Lactation Curve ◽  
Total Milk ◽  
Term Variation

AbstractThis study investigated the factors affecting milk production and lactation curve parameters from the complete lactations of Awassi dairy sheep. The animals were kept in a single flock under intensive management and milked twice daily starting at lambing. Lambs were removed from the ewes at birth into an artificial rearing unit. The results of the analyses of 3740 complete lactations showed a mean litter size of 1·28 lambs born per ewe lambing and average total milk yield of 506 l from lactations 214 days in length and with an average lambing interval of 330 days. Mean lactation number was 3·71 and ewes conceived on average in the 6th month of the lactation. The lactations peaked on day 45 at a yield of 3·44 l. The maximum milk secretion potential of the ewes was 3·9 l/day, with milk yield increasing at 62 g/day mid way between lambing and peak yield and declining at 16·5 g/day mid way between peak and the end of lactation. Age at first lambing, lactation number, litter size, month of lambing and month of conception during the lactation had significant effects (P < 0·05) on some or all of the lactation parameters investigated. Relatively high milk yield was obtained in lactations starting in the January to March period. The monthly effect on milk production was explained by significant (P < 0·05) heat load and photoperiod effects. High milk production was found to have a significant (P < 0·05) adverse effect on reproductive performance. Conception followed a significant (P < 0·05) short term variation in milk production.

The use of short-term secretion rate measurements for estimating the milk production of suckler cows

1978 ◽  
Vol 45 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Y. L. P. Le Du ◽  
R. D. Baker ◽  
J. M. Barker
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Milk Composition ◽  
Secretion Rate ◽  
Short Term ◽  
Beef Cow ◽  
Total Milk ◽  
Fat Yield ◽  
Good Agreement

SummaryTwo experiments with dairy cows and one with suckler cows and their calves were conducted to examine the use of secretion rate measurements for estimating total milk production. In the first experiment both 4- and 6- h intervals between measurements gave similar estimates of total 7-d milk yield. The second experiment compared estimated and measured milk composition as well as yield. Milk and solids-not-fat yields were underestimated with dairy cows as a result of an extended milking interval before measurement. However, fat yield was overestimated, indicating that all residual milk was not removed at the first oxytocinaided milking. It was concluded that for the beef cow, previous interval effects would be eliminated by the frequency of calf suckling, but that residual milk effects might cause a 3–6% and a 16% overestimation of milk and fat yields respectively.In the third experiment, the milk yield of suckler cows was estimated from measurements of secretion rate and from changes in calf weight; good agreement was obtained provided there were at least 3 consecutive controlled sucklings.

scholarly journals Factors affecting milk yield and ewe’s lactation curves estimated with test-day models

2011 ◽  
Vol 51 (No. 11) ◽  
pp. 483-490 ◽  
Author(s):  
M. Oravcová ◽  
M. Margetín ◽  
D. Peškovičová ◽  
J. Daňo ◽  
M. Milerski ◽  
...  
Keyword(s):  
Linear Model ◽  
Litter Size ◽  
Milk Yield ◽  
Fixed Effects ◽  
General Linear Model ◽  
Yield Variability ◽  
Factors Affecting ◽  
Lactation Curve ◽  
Daily Milk Yield ◽  
Daily Milk

Test-day records of purebred Tsigai, Improved Valachian and Lacaune ewes were analysed with a general linear model in order to investigate the effects of flock-test day, lactation number, days in milk, litter size and month of lambing. In total, 121 576 (Tsigai), 247 902 (Improved Valachian) and 2 196 (Lacaune) test-day records gathered over the period 1995&ndash;2005 were included in the analyses. Average daily milk yields were 0.604 &plusmn; 0.279 kg (Tsigai), 0.595 &plusmn; 0.243 kg (Improved Valachian) and 1.053 &plusmn; 0.475 kg (Lacaune). The significant (P &lt; 0.05) or highly significant (P &lt; 0.01) effects of flock-test day, lactation number (except for Lacaune), days in milk, litter size (except for Lacaune) and month of lambing (either fixed effects or covariates) tested by Fisher&rsquo;s tests were shown. The model explained about 50% of daily milk yield variability, with coefficients of determination as follows: 0.479 for Improved Valachian; 0.487 for Tsigai; 0.537 for Lacaune. Differences in estimated least-squares means were tested using multiple-range Scheffe&rsquo;s tests. A lower daily milk yield was found for the first lactation, single litter and lactations starting in March in comparison with daily milk yield for the second and third lactations (except for Lacaune), multiple litter and lactations starting in January and February (except for Improved Valachian). Ali-Schaeffer regression adopted for sheep was used for the fitting of lactation curve according to breed. &nbsp;

Comparing biological and linear models to estimate milk yields and lactation curve parameters

2005 ◽  
Vol 2005 ◽  
pp. 113-113
Author(s):  
B. Albarran-Portillo ◽  
G. E. Pollott
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Yield ◽  
Linear Models ◽  
Computational Effort ◽  
Reasonable Accuracy ◽  
Early Predictors ◽  
Lactation Curve ◽  
Total Milk ◽  
Mathematical Equations

The genetic evaluation of dairy cows is based primarily on milk production and its constituents. Many models have been developed and evaluated in order to estimate total milk yield (CTMY) and other characteristics of lactation curves. Frequently, the models are based on complex mathematical equations and their use demands a huge computational effort. The development of simple models as early predictors of TMY with a reasonable accuracy is important. The objective of this research was to compare the biological model described by Pollott (2000) with two linear models.

Factors affecting the lactation curves of intensively managed sheep based on a clustering approach

2013 ◽  
Vol 80 (4) ◽  
pp. 439-447 ◽  
Author(s):  
Laura Elvira ◽  
Fernando Hernandez ◽  
Pedro Cuesta ◽  
Santiago Cano ◽  
Juan-Vicente Gonzalez-Martin ◽  
...  
Keyword(s):  
Milk Yield ◽  
Clustering Analysis ◽  
Dairy Sheep ◽  
Dry Period ◽  
Factors Affecting ◽  
Lactation Curve ◽  
Total Milk ◽  
Clustering Approach ◽  
Intensively Managed ◽  
Selection Of

This study investigated factors affecting milk production and lactation curves from complete lactations of Lacaune dairy sheep. Animals were part of a single flock under intensive management and were milked twice daily starting at lambing. The results of the analyses of 7788 complete lactations showed an average total milk yield of 434±183 l from lactations 234±63 d long, with an average lambing interval of 302±65 d. A Pollott additive mathematical model was used to estimate complete lactation curves. Clustering analysis identified four lactation types among Lacaune dairy sheep differing mainly in productivity i.e. milk yield per lactation (MY) and length of lactation (DIM). The so-called SL type involved short, less productive lactations (n=2137; 27·4%; MY=222±75·5 l and DIM=182±52·9 d). The SN type involved short lactations of normal productivity (n=2039; 26·2%; MY=396±73·7 l and DIM=205±33·1 d). The LP type involved long and productive lactations (n=2169; 27·9%; MY=487±70·5 l and DIM=265±40·7 d), while the LVP type included long and extremely productive lactations (n=1443; 18·5%; MY=694±114·0 l and DIM=295±54·7 d). Sheep showing the best lactation curves were usually younger than other sheep, and they had higher yield during the previous lactation, a shorter previous dry period (55±50·4 for LP and 61±55·0 d for LVP types) and longer lambing intervals. In addition, they tended to be born in September and to lamb in March, October and December. Sheep were remarkably stable in their lactation curve behaviour: the curve type observed for the first lactation was highly likely to persist in subsequent lactations (P<0·0001). These results suggest that farmers can use the shape of the first lactation curve to guide their selection of ewes for breeding and retention on the farm, thereby improving flock productivity.

A note on correlations between milk production and milk composition of sows and the growth and haemoglobin of their pigs

1967 ◽  
Vol 9 (2) ◽  
pp. 251-253 ◽  
Author(s):  
T. L. Veum ◽  
W. G. Pond ◽  
L. D. Van Vleck
Keyword(s):  
Growth Rate ◽  
Milk Production ◽  
Litter Size ◽  
Milk Yield ◽  
Milk Composition ◽  
Feed Consumption ◽  
Weaning Weight ◽  
Creep Feed ◽  
Total Milk ◽  
Positive Correlations

Total milk yield of sows is positively correlated with litter size (Bonsma and Oosthuizen, 1935; Wells, Beeson and Brady, 1940; Smith, 1952; Allen and Lasley, 1960) even though the amount of milk obtained by each pig decreases with increasing litter size. Positive correlations between sow milk yield and the creep feed consumption of her litter and between weaning weight and milk production have been reported by Bonsma and Oosthuizen (1935), and by Allen and Lasley (1960). Braude (1964) has comprehensively reviewed the literature on the associations between litter size, birth weight and weaning weight. Ward, Rempel and Enfield (1964) reported a positive correlation between weaning weight and post-weaning growth rate in swine.

scholarly journals The influence of calf rearing methods and milking methods on performance traits of crossbred dairy cattle in Thailand – 1. Milk yield and udder health

2004 ◽  
Vol 47 (3) ◽  
pp. 211-224 ◽  
Author(s):  
N. Boonbrahm ◽  
K. J. Peters ◽  
W. Intisang
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Artificial Rearing ◽  
Udder Health ◽  
Total Milk ◽  
Annual Total ◽  
Rearing Methods ◽  
Daily Total ◽  
Milk Feeding ◽  
Calf Rearing

Abstract. Forty crossbred (75–87.5% HF) dairy cows were included in a 2 x 2 factorial experiment composed of hand milking (HM) or machine milking (MM), and artificial rearing (bucket feeding, BR) or restricted suckling (RS). Calf suckling and milk feeding was done until 84 days postpartum. Milking was continued until the end of lactation. MM cows had a significantly (p < 0.05) higher daily saleable milk production (SMP) (7.49 vs. 6.97 kg/day), daily total milk production (TMP) (8.60 vs. 7.96 kg/day) and total lactation milk yield (TLMY) (2297.72 vs. 2137.41 kg) than HM cows. The RS cows had a significantly (P < 0.001) higher TLMY (2455.46 vs. 1979.68 kg), annual total milk yield (ATMY) (2277.23 vs. 1970.73 kg), lactation saleable milk yield (LSMY) (2165.90 vs. 1724.64 kg), annual saleable milk yield (ASMY) (2035.21 vs. 1721.17 kg) and daily saleable milk production (SMP) (7.98 vs. 6.47 kg/day) than the BR cows. The MM cows showed a significantly (p < 0.001) higher somatic cell score (SCS) than their HM herdmates throughout the study period. The BR cows exhibited a significantly (p < 0.001) higher SCS than RS cows

Influence of age at first lambing on reproductive and productive performance of Lacaune dairy sheep under an intensive management system

2011 ◽  
Vol 78 (2) ◽  
pp. 160-167 ◽  
Author(s):  
Fernando Hernandez ◽  
Laura Elvira ◽  
Juan-Vicente Gonzalez-Martin ◽  
Antonio Gonzalez-Bulnes ◽  
Susana Astiz
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Intensive Management ◽  
Productive Performance ◽  
Sequence Group ◽  
Dairy Sheep ◽  
Productive Life ◽  
Total Milk ◽  
Group A ◽  
Effect Of Age

The present study investigated the effect of age at first lambing (AFL) on the performance of Lacaune sheep under intensive management conditions. Records from 3088 maiden sheep from one farm, for the period 2005–2010, were classified into four experimental groups: group E (early) ewes with AFL ⩽390 d; group M (middle) with AFL of 391–450 d; group L (late) with AFL of 451–510 d; and group A (aged) with AFL ⩾511 d. The higher the number of lactations, the lower were the yield/lactation and yield/Day in Milk. Ewes from group M up to 450 days old lambed 0·2 times more often and had 0·25 more lactations than the ewes from group L; in addition, the former group lambed 0·5 times more often and had 0·49 more lactations than ewes from group A. Group A had the lowest yield per lifetime; the yield followed the sequence: group E (1032 l) >group M (1051 l) >group L (989 l) > group A (859 l) (P<0·0001). Yield/lactation was affected by AFL during the first three lactations (P<0·05). Group E produced significantly less milk in the first lactation than ewes from groups M, L and A. AFL correlated negatively with the number of lactations in life (r= −0·26; P<0·0001) and with total milk yield (r= −209; P<0·0001). The productive performance between the ewes that reached puberty early (n=404) or late (n=2684) in life were different (P<0·0001) with the early sheep having a lower total milk yield (591 v. 1073 l, P<0·0001). In conclusion, the current study indicates that the optimal AFL for the Lacaune breed under an intensive dairy system is between 390 and 450 d. Ewes with AFL earlier than 390 d or later than 450 d are likely to have a shorter productive life and a lower lifetime milk production.

scholarly journals THE FACTORS AFFECTING MILK YIELD IN DIARY FARMING IN GREATER GUWAHATI REGION OF ASSAM

2021 ◽  
Vol 9 (08) ◽  
pp. 723-728
Author(s):  
Heman Sarmah ◽  
◽  
Jnanashree Borah ◽  
Tirthankar Sarma ◽  
◽  
...  
Keyword(s):  
Regression Analysis ◽  
Dairy Cattle ◽  
Milk Production ◽  
Milk Yield ◽  
Policy Maker ◽  
Production Cost ◽  
Relative Importance ◽  
Factors Affecting ◽  
Micro Level ◽  
Farming Households

The production of milk is conceived of several factors and a very multifarious process. The knowledge of relative importance of the resource inputs influencing in milk production is essential for the dairy farmer for introducing desirable change in his operation at micro level and for the policy maker for formulating plans for improvements in dairy cattle productivity based on sound economic principles at the macro level (Rao, 1985).The income level of the dairy household is determined by the production of milk they produce at their farms. Generally, the income of the dairy household increases when the milk production cost decreases or when the milk production increases .For this it is essential to study the factors which directly or indirectly effect the milk production. Household samples have been selected both from the municipal wards of Guwahati Municipal Corporation area. Out of 672 dairy farming households, 201 household have been selected for the survey. Regression analysis has been used for the study of factors affecting milk production in greater Guwahati region of Assam.

Factors affecting milk yield and lactation curve fitting in the creole sheep of Chiapas-Mexico

2005 ◽  
Vol 58 (3) ◽  
pp. 265-273 ◽  
Author(s):  
Marisela Peralta-Lailson ◽  
Arturo Ángel Trejo-González ◽  
Pastor Pedraza-Villagómez ◽  
José M. Berruecos-Villalobos ◽  
Carlos G. Vasquez
Keyword(s):  
Milk Yield ◽  
Curve Fitting ◽  
Factors Affecting ◽  
Lactation Curve ◽  
Fitting In

EFFECTS OF FEEDING A HIGH LEVEL OF TOWER RAPESEED MEAL IN DAIRY RATIONS ON FEED INTAKE AND MILK PRODUCTION

1977 ◽  
Vol 57 (4) ◽  
pp. 653-662 ◽  
Author(s):  
H. R. SHARMA ◽  
J. R. INGALLS ◽  
J. A. MCKIRDY
Keyword(s):  
Adverse Effect ◽  
Milk Production ◽  
Milk Yield ◽  
Feed Intake ◽  
Milk Fat ◽  
Rapeseed Meal ◽  
Feed Consumption ◽  
Short Term ◽  
N Retention ◽  
High Level

In experiment 1, 12 cows were used to compare the two (0–0) rapeseed meal (1788 and Tower) varieties with the commercial rapeseed meal (CRSM) and soybean meal (SBM). Feed intake, milk yield and fat content were not different (P > 0.05) among the four treatments; however, protein content was higher (P < 0.05) for the cows fed CRSM and SBM diets than for those fed the 1788–RSM diet. But more (P < 0.05) milk fat was produced by the cows fed 1788–RSM than by those fed CRSM and SBM diets. In experiment 2, eight cows were used to determine the effects of replacing SBM with Tower and also replacing a portion of Tower with urea (TU) in a mixed or extruded (TUE) form on feed intake, milk yield and nitrogen (N) retention. No differences were observed in feed consumption, milk yield or composition among the treatments. Serum thyroxine (T4) level was higher (P < 0.05) for the cows fed SBM than for those fed the 1788–SBM and was similar to levels for cows fed CRSM and Tower in the first experiment. However, no differences were found in thyroxine level in the second experiment. Extrusion of Tower–urea mixture increased (P < 0.05) the N retention compared with other treatments. These short-term studies suggest that up to 25% Tower RSM can be used in dairy rations without adverse effect on performance.

Sign in / Sign up

Export Citation Format

Share Document