scholarly journals Intramammary antibiotic withdrawal periods for dairy goats compared to those for dairy cattle

2008 ◽  
Vol 75 (3) ◽  
Author(s):  
I.M. Petzer ◽  
E.F. Donkin ◽  
E. Du Preez ◽  
J. Karzis ◽  
T.J. Van der Schans ◽  
...  
Keyword(s):  
Milk Yield ◽  
Animal Health ◽  
Safety Margin ◽  
Dairy Goats ◽  
Positive Correlation ◽  
Milk Samples ◽  
Stage Of Lactation ◽  
Significant Difference ◽  
Positive Correlations ◽  
Composite Samples

This study investigated the withdrawal periods (WP) of two intramammary antibiotics Cloxamast LC (Intervet SA) and Spectrazol Milking Cow (Schering-Plough Animal Health) in dairy goats and compared them to those recommended for use in cattle. The WP for Cloxamast LC, measured by the Thermo Resistant Inhibitory Substances (TRIS) test, was 60 h in composite samples, 56 h in udder half samples, and the dye was visible for up to 56 h. The WP was significantly shorter than the 72 h recommended WP for use in cattle. It was however significantly longer when the 24 h safety margin (48 h) was subtracted from the recommended WP for cattle. For Spectrazol Milking Cow the antibiotics could be detected by the TRIS test for 61 h in composite samples and 59 h in udder half samples. This did not differ significantly from the recommended 60 h WP for cattle. However, it was significantly longer than that recommended for use in cattle without the 24 h safety margin. There was no significant difference in WP between infected and non-infected udder halves, while there was a weak positive correlation between WP and stage of lactation (R2 = 0.253). There was a moderate positive correlation (R2 = 0.583) between the TRIS test and the presence of dye in milk in udder half samples and between WP in both udder half and composite milk samples (R2 = 0.456). Weak to moderate positive correlations were present between milk yield and the WP in both udder half (R2 = 0.414) and composite (R2 = 0.262) milk samples. Significant differences (P < 0.001) were also observed between the milk yield of udder halves with and without palpable udder damage and between samples that tested TRIS positive and negative on both composite (P = 0.008) and udder half samples (P < 0.001). There was no significant difference between the milk yield of samples with or without dye. There was a significant difference in milk yield between infected and non-infected udder halves (P = 0.054) and a weak negative correlation between milk yield and stage of lactation (R2 = -0.379).

scholarly journals Value of tests for evaluating udder health in dairy goats: somatic cell counts, California Milk Cell Test and electrical conductivity

2008 ◽  
Vol 75 (4) ◽  
Author(s):  
I.M. Petzer ◽  
E.F. Donkin ◽  
E. Du Preez ◽  
J. Karzis ◽  
T.J. Van der schans ◽  
...  
Keyword(s):  
Somatic Cell ◽  
Milk Yield ◽  
Dairy Goats ◽  
Control Groups ◽  
Positive Correlation ◽  
Milk Samples ◽  
Stage Of Lactation ◽  
Cell Test ◽  
Positive Correlations ◽  
And Control

The value of electric conductivity (EC), California Milk Cell Test (CMCT) and somatic cell count (SCC) as diagnostic tools was investigated in dairy goats. Conductivity colour reading correlated with SCC. Milk samples with conductivity colour red had significantly higher SCC than those with conductivity colours green and orange (P < 0.001). There were moderate positive correlations between CMCT (R2 = 0.470), and conductivity score and CMCT and conductivity colour readings (R2 = 0.597). Conductivity scores were significantly (P < 0.001) higher during and after intra-mammary treatment with Cloxamast LC and conductivity colours were significantly different between treatment and control groups (P < 0.001). There was a weak positive correlation between conductivity colour and stage of lactation (R2 = 0.317) and a moderately positive correlation between conductivity score and stage of lactation (R2 = 0.523). A moderately negative correlation was shown between milk yield and conductivity score (R2 = -0.426) and between milk yield and conductivity colour (R2 = -0.433). Moderate positive correlations were present between CMCT and SCC (R2 = 0.689) and between CMCT and stage of lactation (R2 = 0.459). CMCT ratings were significantly different (P < 0.001) for the intramammary treatment groups. CMCT ratings for infected and non-infected udder halves (P = 0.008) were significantly different; as were those for infected and non-infected udder halves and for left and right udder halves separately (P = 0.010). CMCT ratings for milk samples with SCC above and below 750 x 103 cells per mℓ were significantly different (P < 0.001) as well as for milk from treated and control udder halves with SCC below or above 750 x 103 cells per mℓ (P < 0.001). CMCT was found to be more accurate for indicating the absence of mastitis than for diagnosing it. There were significant differences in log SCC between treatment and control groups, during and after treatment. Infected udder halves had significantly higher log SCC than non-infected udder halves before and after treatment, but not during treatment. There was a moderate positive correlation between stage of lactation and SCC (R2 = 0.438).

scholarly journals Intramammary antibiotics in dairy goats : effect of stage of lactation, parity and milk volume on withdrawal periods, and the effect of treatment on milk compositional quality

2007 ◽  
Vol 74 (3) ◽  
Author(s):  
J. Karzis ◽  
E.F. Donkin ◽  
I.M. Petzer
Keyword(s):  
Negative Correlation ◽  
Milk Fat ◽  
Animal Health ◽  
Cow Milk ◽  
Strong Positive Correlation ◽  
Withdrawal Period ◽  
Dairy Goats ◽  
Positive Correlation ◽  
Stage Of Lactation ◽  
Moderate Negative Correlation

The length of the antibiotic withdrawal period after intramammary treatment was influenced by the milk yield of dairy goats during this trial. Shorter withdrawal periods were seen in relatively high yielding dairy goats (production above 1.5 ℓ per day) compared to low producers (less than 1.3 ℓ per day). High yielding goats treated with Curaclox LC (Norbrook [Pharmacia AH]) had a withdrawal period of 42 h, while low yielding goats, treated with the same product, had a withdrawal period of 74 h. The recommended withdrawal period for Curaclox LC for use in cattle is 72 h. Relatively high yielding goats treated with Rilexine 200 LC (Logos Agvet [Virbac]) had a significantly shorter withdrawal period (37 h) than that recommended for use in cattle (96 h). Low yielding goats treated with Spectrazol Milking Cow (Schering-Plough Animal Health) had a significantly longer (95 h) withdrawal period than that recommended for use in cattle (60 h). Withdrawal periods were also influenced by stage of lactation and parity. There was a moderate positive correlation between lactation number and withdrawal period, as measured by TRIS (R2 = 0.621), and a moderate negative correlation between stage of lactation and withdrawal period (R2 = -0.669). In Trials 1, 2 and 3 combined there was a moderate negative correlation between withdrawal period and volume (R2 = -0.511) and a strong positive correlation between withdrawal period and lactation number (R2 = 0.720). The differences in percentage milk fat, protein and lactose before, during and after treatment were not statistically significant except in Trial 3 (Curaclox LC and Rilexine 200 LC) where protein and lactose differed significantly. In Trial 2 (Spectrazol Milking Cow) milk fat percentages differed significantly between treatment and control groups as did protein percentages in Trial 3. These differences are however, not biologically meaningful.

scholarly journals Effect of milking time, lactation stage and udder traits on milk yield of Red Sokoto and Boer goats in semi-arid, Nigeria

2021 ◽  
Vol 48 (5) ◽  
pp. 100-112
Author(s):  
H. A. Muhammad ◽  
Y. Garba ◽  
D. Ogah ◽  
S.K. Inusa
Keyword(s):  
Milk Yield ◽  
Early Stage ◽  
Significant Interaction Effect ◽  
Boer Goat ◽  
Milk Samples ◽  
Stage Of Lactation ◽  
Lactation Stage ◽  
Significant Difference ◽  
Morning Milk ◽  
Boer Goats

The aim of the study was to evaluate the effect of milking time, lactation stage and udder traits on milk yield of Red Sokoto and Boer goats at the farm of Centre for Dry-land Agriculture, Bayero University Kano, Nigeria. The first evaluation of milk yield was done at early stage of lactation starting after day seven of kidding to exclude colostrum. Daily collection of milk samples followed in the morning and evening until 10 weeks of lactation. The weeks were divided into 3 stages of lactation as early, mid and late lactation stages. Milk samples were measured using a 100 mL measuring cylinder and later converted into grammes. The external udder measurements were taken in cm after seven days post kidding and fortnightly for the period of lactation. The result obtained shows significant difference (p<0.05) in the total morning milk yield between the goats. The total morning milk yield was higher (2642.00 ± 3.18 g) in the Boer goats than in the Red Sokoto (2371.50± 3.18 g). However, the average daily milk yield, total milk yield and total evening milk yield were not significantly (p>0.05) affected by the breeds of goat. Mean milk yield was significantly (p<0.05) influenced by stage of lactation and time of milking. The milk yield was significantly higher (98.91 g) in the late lactation while the least was obtained in the mid stage of lactation (65.44 g). Moreover, the morning milk yield was significantly higher than the evening milk yield. A significant interaction effect (p<0.05) of lactation stage and milking time was similarly observed. The results indicated that breed significantly (p<0.05) influenced most of the udder traits except UC, UW and TFD. Significantly (p<0.05) higher values of UL, UW, TC, RTL, LTL, CH and TFD were recorded in the Red Sokoto. Furthermore, the Boer goat breed had significantly higher values of NT, UC and DBT.     Le but de l'étude était d'évaluer l'effet de la traite de traite, de la phase de lactation et des traits de la piste sur le rendement du lait de Red Sokoto et des chèvres de Boer à la ferme du Centre d'agriculture à sec, de l'Université Bayero Kano, du Nigéria. La première évaluation du rendement en lait a été effectuée à un stade précoce de l'allaitement à partir de sept jours de blague pour exclure le colostrum. La collecte quotidienne d'échantillons de lait a suivi le matin et le soir jusqu'à 10 semaines de lactation. Les semaines ont été divisées en 3 étapes de la lactation comme des étapes de début et de lactation tardive. Les échantillons de lait ont été mesurés à l'aide d'un cylindre de mesure de 100 ml et convertis ultérieurement en grammes. Les mensurations externes de la mamelle ont été prises en cm après sept jours après la mise bas et tous les quinze jours pendant la période de lactation. Le résultat obtenu présente une différence significative (p <0,05) dans le rendement le lait total du matin entre les chèvres. Le rendement au lait total du matin était plus élevé (2642,00 ± 3,18 g) dans les chèvres Boer que dans le Sokoto rouge (2371.50 ± 3,18 g). Cependant, le rendement quotidien moyen quotidien, le rendement total du lait et le rendement au lait total de la soirée n'étaient pas significativement (p> 0,05) affectés par les races de chèvre. Le rendement en lait moyen était significativement (p <0,05) influencé par la phase de lactation et du temps de traite. Le rendement en lait était significativement plus élevé (98,91 g) à la fin de la lactation, tandis que le moindre a été obtenu au stade moyen de la lactation (65,44 g). De plus, le rendement au lait du matin était nettement supérieur au rendement le lait du soir. Un effet d'interaction significatif (P <0,05) de stade de lactation et de délai de traite a été observé de la même manière. Les résultats ont indiqué que la race de manière significative (p <0,05) a influencé la plupart des traits de pis de la piste, à l'exception des UC, UW et TFD. De manière significative (p <0,05) des valeurs plus élevées d'UL, UW, TC, RTL, LTL, CH et TFD ont été enregistrées dans le Red Sokoto. De plus, la race de chèvre Boer avait des valeurs significativement plus élevées de NT, UC et DBT.

scholarly journals Evaluation of Milk Production and Milk Composition at Different Stages of Saanen Dairy Goats

2021 ◽  
Vol 12 (1S) ◽  
pp. 204-211
Author(s):  
Noor Syaheera Ibrahim ◽  
Farida Hani Ahmad Tajuddin
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Goat Milk ◽  
Milk Composition ◽  
Cow Milk ◽  
Local Market ◽  
Dairy Goats ◽  
Food Regulation ◽  
Milk Samples ◽  
Stage Of Lactation

Milk is an important elements due to its high nutritious and balanced in human diet. In Asian, goat milk is the most consumed because of the unique taste, more nutritious than cow milk. However, milk production and composition values differ at every stage of lactation in goats. Thus, determining the highest milk production and producing the best quality goat milk is essential to satisfy the local market demands. The objective of the present study is to determine the milk yield and milk composition at different lactation stages and to evaluate the lactation curves in Saanen goats. The lactation stages can be categorized into three, early (less than 80 days), mid (80 – 140 days) and late (over 140 days) days in milk (DIM). In total, 90 milk samples were collected from 15 goats representing early (n=5), mid (n=5), and late (n=5) stages of lactation. The Saanen goats were raised under the same conditions, and milking was done early in the morning (9.00am).The milk yield from Saanen goats were collected and measured weekly at each stage of lactation. Milk samples were analyzed for fat, protein, solid non-fat, and lactose. Current result illustrated, there were significant different (p ˂ 0.05) among three stages of lactation in milk yield, solid non-fat, fat, protein and lactose. In terms of food regulation, the Saanen goats almost fully met the standard requirements for milk production and composition. In addition, this study also observes the lactation curves in Saanen goats and analyse the curve shapes and patterns. The average milk yields from three different stages develops a concave downward curve. The results indicated that mid yield increased from early to mid- lactation and decreased thereafter until the end of lactation.

scholarly journals Intramammary antibiotics in dairy goats : withdrawal periods of three intramammary antibiotics compared to recommended withdrawal periods for cows

2007 ◽  
Vol 74 (3) ◽  
Author(s):  
J. Karzis ◽  
E.F. Donkin ◽  
I.M. Petzer
Keyword(s):  
Dairy Cattle ◽  
Animal Health ◽  
Safety Margin ◽  
Withdrawal Period ◽  
Beta Lactam ◽  
Dairy Goats ◽  
Significant Difference ◽  
The Mean ◽  
The One

Intramammary antibiotics are registered and tested for use in dairy cattle. This study investigated withdrawal periods of three intramammary antibiotics (Curaclox LC [Norbrook Pharmacia AH]), Spectrazol Milking Cow (Schering-Plough Animal Health) and Rilexine 200 LC (Logos Agvet [Virbac]) in dairy goats and compared them to withdrawal periods recommended for use in cattle. Three trials were carried out in two different herds. The withdrawal periods for Curaclox LC in eight relatively low producing Saanen goats were 74.3 h (+ 19.21) measured by Thermo-Resistant Inhibitory Substances (TRIS), 90.0 h (+ 16.97) measured by colour dye, 99.4 h (+ 9.07) for cloxacillin measured by Parallux Beta Lactam Assay test (IDEXX distributors), and 92.6 h (+ 11.41) for ampicillin measured by Parallux. The withdrawal period for Curaclox LC recommended for use in cattle (72 h) was significantly shorter than the withdrawal periods as measured by colour dye (P < 0.001), Parallux testing for cloxacillin (P < 0.001) and ampicillin (P = 0.003). There was a significant difference in withdrawal periods as measured by TRIS (P = 0.009) and colour dye (P = 0.036). The mean withdrawal periods measured on 12 relatively high producing Saanen and Saanen-Toggenburg crossbreed dairy goats measured by TRIS, colour dye and Parallux for ampicillin and cloxacillin were, however, shorter at 42.0 h (+ 7.077), 64.5 h (+ 60.26), 77.3 h (+ 13.56) and 70.7 h (+ 12.65), respectively. These withdrawal periods for Curaclox LC were significantly longer than the withdrawal periods recommended for cattle as measured by TRIS (P < 0.001) and colour dye (P < 0.001). The combined withdrawal periods for Curaclox LC in the two trials as measured by TRIS, colour dye, Parallux testing for Cloxacillin and Ampicillin were 58.64h (+ 24.31), 75.8 h (+ 17.70), 87.0 h (+ 16.10) and 80.3 h (+ 16.23), respectively. The withdrawal period, when data of the two trials were combined, measured by TRIS (P < 0.001) was significantly longer than the withdrawal period recommended for use in cattle. The mean withdrawal period as measured by TRIS for Spectrazol Milking Cow for seven relatively low producing Saanen dairy goats was 95.3 h (+ 17.23). This was significantly (P < 0.001) longer than the withdrawal period recommended for use in cattle (60 h) for Spectrazol Milking Cow.The mean withdrawal period as measured by TRIS for Rilexine 200 LC for 20 relatively high producing Saanen and Saanen-Toggenburg crossbreed dairy goats was 36.9 h (+ 9.943) and was significantly (P < 0.001) shorter than the withdrawal period as recommended for use in cattle (96 h). There were also significant differences in all the one-sample t-tests between withdrawal periods for goats and recommended withdrawal periods for cattle without the 24 h safety margin.

scholarly journals RELATIONSHIP BETWEEN BLOOD METABOLIC PROFILES AND MILK YIELD ASSOCIATED WITH PARITY AND STAGE OF LACTATION IN CROSSBRED DAIRY COWS IN BANGLADESH

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
L Naher ◽  
M. A. Samad ◽  
S. H. M. F. Siddiki ◽  
M. T. Islam
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Metabolic Profile ◽  
Transition Period ◽  
Dairy Herds ◽  
Metabolic Profiles ◽  
Milk Samples ◽  
Stage Of Lactation ◽  
Lactating Dairy Cows ◽  
Calcium Phosphorus

Background: Cattle cross-breeding program has been launched throughout Bangladesh but this program has still focused mainly on biological rather than economic evaluation. Currently, 30000 dairy farms with mainly cross-bred cows are in operation throughout the country and this intensive dairy farming system with high milk yielding dairy cows is supposed to be associated with high incidence of sub-clinical nutritional and metabolic diseases. Objectives: The objective of this study was to detect the relationship between major blood metabolic profiles and milk yield associated with parity and stage of lactation in cross-bred dairy cows. Materials and Methods: Blood samples of 220 apparently healthy lactating cross-bred dairy cows (HF x L, n = 190; SH x L, n = 20 and JS x L, n = 10) of 10 dairy herds were collected for metabolic profile test (MPT) in Bangladesh during the period from July to November 2016. The major metabolic profiles which are associated with milk fever (calcium, phosphorus & magnesium) and ketosis (glucose) were considered in this study. These biochemical parameters were estimated to detect the influence of risk factors including herds, breeds, parities and lactation age of cross-bred lactating dairy cows by using the commercial kits in spectrophotometer method. Results: The evaluation of the biochemical constituents of 220 cross-bred lactating dairy cows revealed that 30% (n = 66) had hypocalcaemia and 20.45% (n = 45) had hypoglycemia. Significantly lower levels of average calcium (7.93 ± 0.36 mg/dl; p < 0.024) and glucose (43.44 ± 3.63 mg/dl; p < 0.0001) values were recorded in HF x L cross-bred dairy herd of BAUDF, Mymensingh in comparison to other investigated nine dairy herds. The highest milk yield was recorded at 7th parity (16 +- 0.91 liter / day) and 1st week of lactation (17.33 +- 1.09 liter / day) were associated with low mean calcium (8.09 +- 0.85 mg / dl; 6.68 +- 0.13 mg/dl) and glucose (36.45 +- 7.67 mg/dl; 32.31 +- 3.90 mg / dl) levels in comparison to the respective values of different parity and lactation weeks. Conclusions: A relationship between blood metabolic profiles and milk yield associated with herd, breed, parity and lactation stages was recorded in lactating crossbred dairy cows. The evaluation of blood metabolites at different stages of lactation cycle especially at transition period is required to detect the nutritional and metabolic health for optimum milk production and to achieve maximum reproductive potential of high yielding dairy cattle. The readily available milk samples could be used as a biological fluid to monitor the health and nutritional status of dairy cows by using mid-infrared (MIR) spectroscopy method to prevent sub-clinical metabolic disorders. Therefore, well developed laboratories with necessary equipment, test kits and reagent should be provided to perform MPT in both the blood and milk samples for practical uses. Keywords: Compton metabolic profile test, Metabolic profile, Lactating cross-bred cows, Calcium, Phosphorus, Magnesium, Glucose, Parity, Lactation stages

scholarly journals COMPARATIVE PERFORMANCE OF THE INDIGENOUS AND EXOTIC SOWS IN NIGERIA

2021 ◽  
Vol 6 ◽  
pp. 26-32
Author(s):  
O. A. Adebambo ◽  
A. E. Dettmers
Keyword(s):  
Body Weight ◽  
Litter Size ◽  
Milk Yield ◽  
Wet Season ◽  
Large White ◽  
Comparative Performance ◽  
Effi Ciency ◽  
Average Litter Size ◽  
Significant Difference ◽  
Positive Correlations

THE indigenous sow of Nigeria which is about half the size of the exotic large white, Landrace or crossbred pigs at maturity (60 vs 128-141kg) has an average milk yield of 75kg as compared to 130 148kg of the exotic breeds during an eight week lactation. Peak production was reached between the third and fifth weeks of lactation by the impor ted, while the native sow showed quite a slight peak but with greater persistency. For all geno types compared, milk yield was lower in the dry season (P< 0.05) than in the wet season (123 vs 134kg) and higher for sows (P < 0.05) than for gilts (135 vs 121kg). With an average litter size of 5-8 pigs, available milk per piglet was between 16kg in the Indigenous SOW and 28kg in the Landrace soWS (P < 0.05) and a significant difference (P < 0.05) in effi ciency of milk utilization by the piglets in the range of Crossbred, followed by the purebreds, the indigenous being the least efficient in relation to unit metabolic size Milk production did not differ among the genotypes. The high positive correlations (P < 0.05) between milk yield and body weight at farrow and the unit metablie size as well as between milk intake and litter size might serve as a useful tool in selection for the Nigerian Indigenous pigs as the higher body weight tend to be correlated to a higher milk yield and a correspondingly large litter size.

scholarly journals The effect of breed and stage of lactation on the microbiological status of raw milk

2019 ◽  
pp. 37-45
Author(s):  
Flóra Mária Petróczki ◽  
Tema Andualem Tonamo ◽  
Béla Béri ◽  
Ferenc Peles
Keyword(s):  
Microbiological Quality ◽  
Raw Milk ◽  
Coliform Count ◽  
Milk Samples ◽  
Stage Of Lactation ◽  
Holstein Friesian ◽  
Significant Difference ◽  
Jersey Cows ◽  
Friesian Cows

The microbiological quality of the milk is important not only for food safety, but it can also influence the quality of dairy products. The microbiological status of raw cow milk can be influenced by many factors. Our aim was to determine whether there was a difference between the microbiological quality of milk of two different cow breeds (Holstein Friesian and Jersey) kept and milked in the same conditions, and how the microbiological quality of the raw cow milk changed during lactation (beginning, mid, and end). Samples were taken and analysed in July, August and September in 2018 from two dairy farms in Hajdú-Bihar county. During the conducted studies, the total plate count (TPC), the coliform count, the Staphylococcus aureus count and the coagulase-negative Staphylococcus (CNS) count of raw milk samples were determined. There was no significant difference (P>0.05) between the milk of the Holstein Friesian and Jersey breeds in the case of TPC. However, the mean coliform count of milk samples taken from Holstein Friesian cows was significantly lower (P<0.05) than the mean coliform count of milk samples taken from Jersey cows. S. aureus was detected in one of the twelve milk samples taken from Holstein Friesian cows, and in two of the eleven milk samples taken from Jersey cows. CNS was found in larger amount in milk samples taken from Holstein Friesian cows, and the difference was significant (P<0.05). Both TPC and CNS count were significantly higher (P<0.05) in individual milk samples taken at the end stage of lactation, than in samples taken in the earlier stages of lactation from Farm “A”. However, in the case of Farm “B”, there was no significant difference (P>0.05) in colony counts at different stages of lactation. S. aureus was only present in milk samples that collected from cows, which were at the beginning and middle stages of lactation. Testimg the hemolysin production ability of S. aureus strains isolated from the raw milk samples, only weak hemolysis was observed on blood agar. In case of antibiotic resistance testing, it was found that all strains were susceptible to cefoxitin, chloramphenicol, clindamycin, erythromycin, gentamicin, penicillin G, tetracycline and trimethoprim/sulphamethoxazole. Based on the results of our studies, staphylococci were detected in a higher amount in the milk of Holstein Friesian cows, and coliform bacteria were detected in a higher number in the milk of Jersey cows. Summing up the results of the milk samples taken from the different stages of lactation in one of the farms, it can be concluded that higher TPC and CNS count could be detected at the end stage of lactation than in the samples taken from the earlier stages of lactation. The fact that at the end of lactation the microorganisms could be detected in a higher colony count may be related to the fact that teats could be damaged during lactation by the milking machine, which increased the chance of imvading the microorganisms into the udder.

scholarly journals Factors affecting goat milk yield and its composition

2011 ◽  
Vol 49 (No. 11) ◽  
pp. 465-473 ◽  
Author(s):  
G. Ciappesoni ◽  
JPřibyl ◽  
M. Milerski ◽  
V. Mareš
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Statistical Models ◽  
Goat Milk ◽  
Dairy Goats ◽  
Factors Affecting ◽  
Stage Of Lactation ◽  
Daily Milk Production ◽  
Model Equations ◽  
Daily Milk

The aim of the paper was to prove the accuracy of various statistical models of vari&shy;ance analysis for estimation of systematic factors that influence milk yield and fat and protein content in dairy goats. Data on daily milk production recorded by methods AT, AC or A4 for the population of Czech White Shorthaired Goats over 1992&ndash;2002 was used for calculations. A total of 78 736 test day from 6 234 goats were analysed. Average daily milk production was 3.09 kg with 3.72% of fat and 2.84% of protein. Variability of examined traits was significantly influenced by effects of herd-year or herd-test day, litter size, parity, season of kidding, stage of lactation and the combined effect parity-year-season of kidding. The variants of model equations in which complex effects of herd-year were replaced by effects of herd-test day showed higher values of reliability for the three traits analysed. &nbsp;

scholarly journals Bayesian Analysis of the Association between Casein Complex Haplotype Variants and Milk Yield, Composition, and Curve Shape Parameters in Murciano-Granadina Goats

Animals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1845
Author(s):  
María Gabriela Pizarro Inostroza ◽  
Francisco Javier Navas González ◽  
Vincenzo Landi ◽  
Jose Manuel León Jurado ◽  
Juan Vicente Delgado Bermejo ◽  
...  
Keyword(s):  
Milk Yield ◽  
Dry Matter ◽  
Somatic Cells ◽  
Nucleotide Polymorphisms ◽  
Curve Shape ◽  
Shape Parameters ◽  
Dairy Goats ◽  
Significant Difference ◽  
Best Fitting ◽  
Fitting Model

Considering casein haplotype variants rather than SNPs may maximize the understanding of heritable mechanisms and their implication on the expression of functional traits related to milk production. Effects of casein complex haplotypes on milk yield, milk composition, and curve shape parameters were used using a Bayesian inference for ANOVA. We identified 48 single nucleotide polymorphisms (SNPs) present in the casein complex of 159 unrelated individuals of diverse ancestry, which were organized into 86 haplotypes. The Ali and Schaeffer model was chosen as the best fitting model for milk yield (Kg), protein, fat, dry matter, and lactose (%), while parabolic yield-density was chosen as the best fitting model for somatic cells count (SCC × 103 sc/mL). Peak and persistence for all traits were computed respectively. Statistically significant differences (p < 0.05) were found for milk yield and components. However, no significant difference was found for any curve shape parameter except for protein percentage peak. Those haplotypes for which higher milk yields were reported were the ones that had higher percentages for protein, fat, dry matter, and lactose, while the opposite trend was described by somatic cells counts. Conclusively, casein complex haplotypes can be considered in selection strategies for economically important traits in dairy goats.

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