scholarly journals HEAT STRESSED HOLSTEIN HEIFERS - THRESHOLD DETERMINATION IN CENTRAL CROATIA

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
V. Gantner ◽  
P. Mijić ◽  
K. Kuterovac ◽  
Z. Barać ◽  
K. Potočnik
Keyword(s):  
Milk Yield ◽  
Threshold Value ◽  
Least Square ◽  
Dairy Farmers ◽  
Daily Production ◽  
Breeding Values ◽  
Daily Milk Yield ◽  
Financial Losses ◽  
Daily Milk

In the light of increasingly rapid climate change worldwide, and with the purpose of reduction of financial losses of dairy farmers and enabling the sustainable farming, the necessity of implementation of breeding values for heat resistance in breeding strategies, have become more and more pronounced. Estimation of breeding values requires determination of THI threshold value. Therefore, the objective of this research was to determine the THI threshold value for Holstein heifers in environmental conditions in Central Croatia. With that purpose individual test-day records of Holstein heifers with records of ambient temperature and relative humidity in the barns collected in regular milk recording from January 2006 to December 2012 were analysed. The THI threshold values for daily milk yield were determined by least square analyses of variance for each given THI value (from 65 to 76) using the PROC MIXED (SAS). The THI ≥ 65 cause significant change in Holstein heifers’ daily production. Significant decrease of daily milk yield was observed at THI = 65 with estimated drop from 0.087 till 0.254 kg milk/day (THI from 65 – 76). The THI = 65, as the lowest value at which significant decrease in daily milk yield was determined was taken as the threshold value for Holstein heifers in Central Croatia.

scholarly journals Determination of the Effect of Daily Production Level of Primiparous Holstein Cows on Response to Heat Stress Conditions (THI Threshold) in Eastern Croatia

2018 ◽  
Vol 19 (2) ◽  
pp. 89 ◽  
Author(s):  
Ivana Jožef ◽  
Maja Gregić ◽  
Tina Bobić ◽  
Božo Važić ◽  
Vesna Gantner
Keyword(s):  
Heat Stress ◽  
Milk Yield ◽  
Stress Conditions ◽  
Least Square ◽  
Production Level ◽  
Holstein Cows ◽  
Daily Production ◽  
Significant Drop ◽  
Daily Milk Yield ◽  
Daily Milk

The goal of this paper was to determine the effect of daily production level of primiparous Holstein cows kept on dairy cattle farms in Eastern Croatia on response to heat stress conditions (THI threshold). With that purpose, individual test-day records with data on ambient temperature and relative humidity in the barns were analysed. Data were collected in regular milk recording from 2006-2012. The THI threshold values for daily milk yield were determined by least square analyses of variance for each given THI value (from 68 to 72) using the PROC MIXED (SAS). Low producing cows experienced significant drop at THI=68, while in high producing primiparous Holsteins first significant drop in daily milk yield was observed when THI=69. Also, the amount of daily production drop depended on cow’s production level (0.155-0.256 kg/day in high producing; 0.319-0.460 kg/day in low producing). It could be concluded that the response of primiparous Holstein cows kept in Eastern Croatia to heat stress conditions depends on daily production level.

Determination of heat stress zone for daily milk yield using carryover heat effect model in Murrah buffaloes

2021 ◽  
Vol 53 (5) ◽  
Author(s):  
Ramandeep Kaur Dhaliwal ◽  
Puneet Malhotra ◽  
Neeraj Kashyap ◽  
Shakti Kant Dash ◽  
Lakhvir Kaur Dhaliwal ◽  
...  
Keyword(s):  
Heat Stress ◽  
Milk Yield ◽  
Heat Effect ◽  
Murrah Buffaloes ◽  
Effect Model ◽  
Stress Zone ◽  
Daily Milk Yield ◽  
Daily Milk

Effect of lameness on the daily milk yield of Holstein-Friesian dairy cows

2007 ◽  
Vol 2007 ◽  
pp. 98-98
Author(s):  
O. M. Onyiro ◽  
S. Brotherstone
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Dairy Farmers ◽  
Linear Type ◽  
Major Health Problem ◽  
Dairy Management ◽  
Economic Production ◽  
Holstein Friesian ◽  
Daily Milk Yield ◽  
Daily Milk

As a major health problem facing dairy farmers worldwide with substantial economic, production and welfare consequences, lameness has attracted much attention over the last two to three decades (Boelling, 1999). Lameness as a linear type trait is measured by locomotion scoring as there is a high genetic correlation between lameness and locomotion score. Studies have included locomotion (as a predictor of lameness) and have associated lameness with no effect, an increase and sometimes a decrease in milk production of cows. Several reasons have been given for these differences and the need still arises for estimates of the effect of lameness on milk yield in herds with current dairy management. The objective of this study was to quantify the effect of lameness on the daily milk yield (DMY) of dairy cows.

Significance of Environmental Influences on Average Daily Milk Traits of Sirohi Goats in Their Native Tract

2019 ◽  
Author(s):  
L. Gautam H.A. Waiz ◽  
R. K. Nagda
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Environmental Conditions ◽  
Genetic Factors ◽  
Genetic Correlations ◽  
Goat Milk ◽  
Least Square ◽  
Milk Traits ◽  
Daily Milk Yield ◽  
Daily Milk

Data on 3244 Sirohi kidding during 2004 to 2016 in farmer’s flocks under All India Co-ordinated Research Project on Goat Improvement (AICRP) project, Vallabhnagar, Udaipur were utilized to estimate the average daily milk (ADM) at different lactation months and subjected to least square analysis to study the effect of various non-genetic factors like cluster, periods of kidding, season of kidding, parity, type of birth and regression of dam’s weight. The overall least-squares means for ADM1, ADM2, ADM3, ADM4, ADM5 and overall ADM were 564.07±18.34, 671.92±15.17, 633.41±10.75, 508.93±8.01, 329.72±7.93 and 540.79±10.78 ml, respectively. Cluster and period wise variation were highly significant on all stages of average daily milk yields. The parity had statistically highly significant effect on average daily milk yields, in which seemed that milk yields increase as parity increase, thereafter declined slowly. The effect of type of kidding was non-significant on all stages of average daily milk yield under this study. The regression of dam’s weight at kidding was positive and highly significant (P£ 0.01) on all average daily milk yield. The heritability estimates for these traits ranged from 0.03 ± 0.01 (ADM4) to 0.19 ± 0.02 0.06 ± 002 (ADM1). The high estimates of genetic correlations of average milk yield of different periods with overall average daily milk yield. The phenotypic correlations were positive and low between ADM1 and ADM4­, ADM5 and medium between ADM1 and ADM4, ADM5. In order to augment goat milk production, goat keepers need to be focused on nutritional and others environmental conditions as it affect their flock.

scholarly journals Estimation of genetic parameters and prediction of breeding values for some economic traits of Black Bengal Goat under farming condition

2020 ◽  
Vol 20 (1-2) ◽  
pp. 8-17
Author(s):  
MA Jalil ◽  
S Akther ◽  
MP Choudhury ◽  
MA Habib
Keyword(s):  
Birth Weight ◽  
Litter Size ◽  
Milk Yield ◽  
Genetic Parameters ◽  
Breeding Values ◽  
Lactation Length ◽  
Total Milk ◽  
Daily Milk Yield ◽  
Black Bengal Goat ◽  
Daily Milk

The study was undertaken to evaluate the genetic progress of Black Bengal Goat (BBG) by estimating genetic parameters viz. heritability and breeding values for economically important productive and reproductive traits (birth weight, weight at 3, 6, 9 & 12 months, daily milk yield, lactation length, total milk yield and litter size of BBG goat population). Variance and co-variance components were analyzed applying Residual Maximum Likelihood (REML) approach by VCE 4.2.5 computer package. The heritability (h2) of birth weight was estimated as 0.2, which was low. The heritability estimates for 3-month weight (0.40), 6-month weight (0.50), 9-month weight (0.37) and 12-month weight (0.36) were found medium. Estimated h2 of daily milk yield, total milk yield and lactation length in this study were from 0.55 to 0.82.  h2 of litter size was 0.09. The maximum estimated breeding value (EBV) was found for 6 month body weight (12.94 kg), however, for daily milk yield, the value was 1.513 kg. The results found in this study revealed that genetic improvement of BBG for most of the traits is possible by selection and breeding. Bangladesh J. of Livestock Res. 20(1-2): 8-17, Jan-Dec 2013

scholarly journals Influence of microclimatic conditions on the daily production of dairy cows

2013 ◽  
Vol 29 (1) ◽  
pp. 45-51 ◽  
Author(s):  
D. Kucevic ◽  
M. Plavsic ◽  
S. Trivunovic ◽  
M. Radinovic ◽  
V. Bogdanovic
Keyword(s):  
Relative Humidity ◽  
Ambient Temperature ◽  
Dairy Cows ◽  
Milk Yield ◽  
Dairy Farm ◽  
Comfort Level ◽  
Daily Production ◽  
Microclimatic Conditions ◽  
Daily Milk Yield ◽  
Daily Milk

The aim of this paper was to determine the microclimatic conditions (ambient temperature and relative humidity) in dairy farm, as well as to evaluate the effect and significance of temperature - humidity index (THI) values on the daily milk yield. The observation of microclimatic parameters was conducted in the period from 9.03.2012 to 6.05.2012. The study included 136 Holstein Friesian cows. The estimation of the effect of THI on daily production of dairy cows was defined by applying fixed-effect statistical model. Average ambient temperature during measuring months amounted to 15.6?C (ranging from 7.2? C to 24.6?C), while the average value of relative humidity was 56.33% (ranging from 40.30% to 81.80%). During the study, the mean value of THI was 58.93 (ranging from 47.08 to 70.13) and didn?t exceed the critical comfort level of 72. All tested fixed-factors were statistically affected the daily milk yield (p <0.01). For each unit of increase in the value of the THI, the amount of milk decreased by 0.05344 kg. This confirmed the importance of regular recording of THI values and microclimatic conditions as a unique indicator of thermal stress in dairy farm.

The influence of dietary protein intake during lactation on the reproductive performance of sows

1969 ◽  
Vol 11 (4) ◽  
pp. 443-451 ◽  
Author(s):  
R. M. MacPherson ◽  
F. W. H. Elsley ◽  
R. I. Smart
Keyword(s):  
Milk Yield ◽  
Crude Protein ◽  
Dry Matter ◽  
Live Weight ◽  
Large White ◽  
Treatment Groups ◽  
Milk Samples ◽  
Daily Milk Yield ◽  
Daily Milk

SUMMARY1. Forty-five Large White gilts were given 2·20 kg daily of a diet containing 14·0% crude protein during three successive pregnancies. During a 6-week lactation they received 5·30 kg daily of one of three diets containing 19·0% (HP), 16·5% (MP) or 14·0% (LP) crude protein.2. Daily milk yield was estimated on the 10th, 20th, 30th and 40th day of lactation. Milk samples were obtained from the same sows for the determination of protein, fat, lactose and total solids on the 11th, 21st, 31st and 41st day.3. One sow and litter from each treatment in each lactation was placed in metabolism cages during lactation and estimates of nitrogen and dry matter excretion obtained.4. As the concentration of protein in the diet decreased the average 42-day gain in litter weight from birth increased significantly in the first lactation. This trend continued in the second lactation although it was not significant but did not appear in the third.5. There was no marked difference in daily milk yield between treatment groups.6. There was a significantly greater loss of live weight by the sows on the lower levels of protein in the first lactation. These differences were not significant in the second and third lactations.

Suitability of simplified methods for monthly and twice-monthly milk recording, and new prediction factors for the alternate a.m./p.m. method in dairy ewes under a low-input production system

2007 ◽  
Vol 74 (4) ◽  
pp. 399-405 ◽  
Author(s):  
M Houcine Othmane ◽  
Latifa Trabelsi
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Production System ◽  
Recording System ◽  
Production Level ◽  
Daily Production ◽  
Low Input ◽  
Testing Method ◽  
Daily Milk Yield ◽  
Daily Milk

Sicilo-Sarde dairy flock test-day data were analysed (1) to check predicting ability of ten milk recording procedures, based on information from a single monthly or bimonthly milking and (2) to look for the best pair of factors for predicting daily milk yield from either morning or afternoon milkings for the alternate testing method (AT). Prior to analyses, data were adjusted for variation factors with known significant effect. Number of test-day observations was 4755 from 458 lactations of 288 ewes. Losses of precision associated with simplified methods were evaluated by comparing estimated lactation yields with those observed both in a reference plan, where the two daily milkings were recorded at 2-weekly intervals and in the official A4 milk recording (monthly recording of the two daily milkings). Ranking of simplified plans based on their accuracy was still the same under either monthly or twice-monthly frequency. Estimates of lactation yields showed more lack of precision when the usual monthly designs were compared with twice-monthly sampling of both a.m. and p.m. milkings. Losses of precision ranged from 5·1%, for the A4 plan, to 14·6%. Thus, milk production should be estimated from both mikings when their measurement is economically feasible. When only one milking is weighed, designs based on—or beginning with—the a.m. milking were more accurate. There was no evidence of improvement in sampling accuracy by adjustment for milking interval or production level. For practical and economic reasons, the design alternating a.m. and p.m. milkings, without adjustment, is suggested for ovine milk recording. In such a case, new factors for estimating daily production from the measured milking (1·7, 2·3) should be used rather than the factors currently in use (2, 2) because they improved the loss of precision by more than 13% in a monthly recording system.

scholarly journals Prediction of test day milk yield by ac method in indigenous Balkan goats in Macedonia

2017 ◽  
Vol 33 (3) ◽  
pp. 299-308 ◽  
Author(s):  
Nikola Pacinovski ◽  
Vladimir Dzabirski ◽  
Georgi Dimov ◽  
Koco Porcu ◽  
Elena Eftimova ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Accurate Result ◽  
Alternative Method ◽  
The Difference ◽  
Daily Milk Yield ◽  
Selection Of ◽  
Daily Milk

Accurate and precise milk recording is one of the most important moments for a successful selection of milking goats. In this context, breeders are constantly making efforts to find the most suitable and cheapest methods for conducting of tests for milk production. The goal of this research was to compare the A4 method (as referent method) with AC method (as alternative method), for determination of milk production, on the day of recording of the indigenous Balkan goat, in the period of 2014-2016 with milking of goats in the morning and evening. It was determined that the difference between the predicted daily milk yield with one milking (in the morning or evening) and the measured milk yield using the A4 method is too low and almost negligible. With the analysis of all factors (year, lactation and number of milk tests), it was determined that the prediction of total daily milk yield, based on the evening milking, provides more accurate result, in relation to the prediction during morning milking, in cases when using the AC method.

Sign in / Sign up

Export Citation Format

Share Document