Effects of dietary supplements of zinc-methionine on milk production, udder health and zinc metabolism in dairy goats

2003 ◽  
Vol 70 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Ahmed AK Salama ◽  
Gerardo Caja ◽  
Elena Albanell ◽  
Xavier Such ◽  
Ramón Casals ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Composition ◽  
Barley Grain ◽  
Zinc Metabolism ◽  
Dairy Goats ◽  
Protein Nitrogen ◽  
Udder Health ◽  
Concentrate Mixture ◽  
True Protein ◽  
Organic Zn

Twenty-two Murciano-Granadina dairy goats were used to investigate the effects of organic Zn supplementation of a diet containing a high level of inorganic Zn. Goats were kept in pens, machine milked once a day throughout lactation and fed a diet based on a dehydrated mixture of whole-plant maize and alfalfa ad libitum, alfalfa pellets, barley grain and a concentrate mixture. Treatments were: (1) control, and (2) supplemented with 1 g/d Zn-Methionine (Zn-Met) included in the concentrate mixture. After parturition, goats were blocked in week 3 and dietary treatments were applied until week 23. From weeks 3–20, feed intake, milk yield, milk composition, milk somatic cell count (SCC), and udder health were measured. In week 21, all goats were injected intraperitoneally with 1 g/d DL-methionine for 5 d to establish the effects of methionine under the conditions of udder stress induced by hand milking on the second day. During weeks 22 and 23, diet digestibility, and N and Zn balance were determined. Dry matter intake, milk yield, and milk contents of total solids, fat, total and true protein, and casein did not differ between treatments, but whey protein and non-protein nitrogen contents were significantly lower for the Zn-Met group. Milk SCC tended to decrease as a result of Zn-Met supplementation but differences between treatments were not significant when halves with persistent infection were excluded. Hand milking increased SCC in both groups, but udders of supplemented goats showed a lower reaction. Apparent absorption of N significantly increased and Zn retention tended to increase in Zn-Met supplemented goats. We conclude that Zn-Met supplementation can enhance resistance to udder stress in dairy goats. Effects were attributed to the organic Zn and not to the methionine component. Zn retention and protein utilization were also improved by the Zn-Met supplement.

scholarly journals Effects of condensed tannin-amended cassava silage blend diets on feeding behavior, digestibility, nitrogen balance, milk yield and milk composition in dairy goats

animal ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 100015
Author(s):  
T.V.C. Nascimento ◽  
R.L. Oliveira ◽  
D.R. Menezes ◽  
A.R.F. de Lucena ◽  
M.A.Á. Queiroz ◽  
...  
Keyword(s):  
Feeding Behavior ◽  
Milk Yield ◽  
Nitrogen Balance ◽  
Condensed Tannin ◽  
Milk Composition ◽  
Dairy Goats

SUBSTITUTION OF RAPESEED MEAL FOR SOYBEAN MEAL AS A SOURCE OF PROTEIN FOR LACTATING COWS

1976 ◽  
Vol 56 (2) ◽  
pp. 233-242 ◽  
Author(s):  
L. J. FISHER ◽  
DOROTHY S. WALSH
Keyword(s):  
Milk Yield ◽  
Dry Matter ◽  
Rapeseed Meal ◽  
Milk Composition ◽  
Hormone Metabolism ◽  
Thyroid Hormone Metabolism ◽  
Lactating Cows ◽  
Lower Blood ◽  
Concentrate Mixture ◽  
Low Erucic Acid

Sixteen lactating Holstein cows were randomly assigned to treatment sequences in a 4 × 4 changeover experiment. Experimental periods were 28 days in length separated by 7 days for changeover. Cows were fed corn silage free choice and gradually increasing amounts of one of four dairy concentrates containing 0, 11, 22, or 34% rapeseed meal (RSM) of a Canadian, experimental, low glucosinolate–low erucic acid variety. Concentrate intake (kg dry matter/day), milk yield (kg/day) and body weight change (kg/28 days) were 8.45a, 8.71a, 8.37a and 7.17b; 24.40a, 24.03ab, 22.92bc and 21.96c and 7.6b, 22.4b, 13.0ab, and 3.0b for 0, 11, 22 and 34% RSM mixtures, respectively. There was no influence of treatment on milk composition. Ration dry matter (DM) and nitrogen digestibilities declined (P < 0.05) as the RSM in the concentrate mixture increased. The amount of nitrogen excreted in the urine was greatest for cows fed 0% RSM and least for cows fed 34% RSM. Cows fed concentrate mixtures containing 34% RSM had a lower blood thyroxine level than others (P < 0.05), but RSM-containing concentrates had no apparent effect on the conversion of thyroxine to triiodothyronine. Results of the trial indicated that this experimental variety of RSM had no detrimental effect on concentrate intake, DM digestibility, milk composition or thyroid hormone metabolism when included at levels up to 22% in the concentrate mixture. However, milk yield and apparent digestibility of ration nitrogen were decreased (P < 0.05) by the 22% RSM mixture. It was not certain from the current findings whether the depression in digestibility was due largely to the high oil content of the meal or due to the higher fiber content of the RSM-supplemented rations.

The composition of milk of British Alpine and Anglo–Nubian goats imported into Trinidad

1972 ◽  
Vol 39 (3) ◽  
pp. 381-385 ◽  
Author(s):  
C. Devendra
Keyword(s):  
Milk Composition ◽  
Pennisetum Purpureum ◽  
Dairy Goats ◽  
Mineral Contents ◽  
Total N ◽  
Total Solids ◽  
Concentrate Mixture ◽  
The Mean ◽  
Inadequate Nutrition ◽  
The Tropics

SummaryThe variations in the composition of milk over an 18-week period from lactating British Alpine and Anglo–Nubian goats imported into Trinidad are reported. The animals were fed Napier grass (Pennisetum purpureum) ad lib. and 2 lb of a proprietary concentrate mixture daily.The mean percentage contents of the milks of British Alpine and Anglo–Nubian goats were: total solids 11·49±0·22, 12·17±0·28; butterfat 3·42±0·18, 4·06±0·22; total N 0·462±0·04, 0·530±0·07; ash 0·78±0·02, 0·79±0·03 and ‘lactose’ 4·38±0·28, 4·05±0·55. Anglo–Nubian goats had a higher content of percentage total solids, fat, total N and ash. For all constituents the coefficient of variation between weeks was higher for Anglo–Nubian goats. No significant trends were found between weeks for each of the components analysed for both breeds. Statistically significant correlations (P < 0·01) were found between percentage fat and percentage total N for both breeds.The mean mineral contents (mg/100ml) for the milks of British Alpine and Anglo–Nubian goats were: Na 52·6±4·6, 55·5±1·9; K164·0±8·4, 133·4±11·4; Ca 85·5±11·6, 89·9±9·8; Mg 13·2±3·8, 10·2±1·6 and P 74·7±3·9, 82·1±3·9. British Alpine goat's milk had a higher content of K and that of Anglo–Nubian goats had a higher content of P; both differences were statistically significant (P < 0·01).The milk composition figures in this study together with those from a similar study in Guadeloupe suggest that the values are low and considerably lower in comparison with the same breeds of goats in a temperate environment. This could be a feature of dairy goats imported into the tropics due perhaps to inadequate nutrition. Much more information is needed to verify this possibility.

scholarly journals Effects of Once Versus Twice Daily Milking Throughout Lactation on Milk Yield and Milk Composition in Dairy Goats

2003 ◽  
Vol 86 (5) ◽  
pp. 1673-1680 ◽  
Author(s):  
A.A.K. Salama ◽  
X. Such ◽  
G. Caja ◽  
M. Rovai ◽  
R. Casals ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Composition ◽  
Dairy Goats

The effect of ammoniated and roasted barley on rumen pH, milk yield and milk composition of lactating dairy cows

2003 ◽  
Vol 2003 ◽  
pp. 107-107
Author(s):  
M. H. Fathi ◽  
A. Nikkhah
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Milk Fat ◽  
Dry Matter ◽  
Metabolic Disorders ◽  
Milk Composition ◽  
Barley Grain ◽  
Nutrient Requirements ◽  
Rumen Ph ◽  
Lactating Dairy Cows

Cereal grains can provide the major source of energy in diets in order to meet the nutrient requirements of high producing dairy cows. However the amount of starch that can be included in the diets of dairy cows is limited particularly if starch is rapidly fermented such as barley starch. Reduction of feed intake, rumen pH, milk fat test, microbial growth and other metabolic disorders are expected if ruminally degradable starch is fed in amount that cant be efficiently metabolized by rumen microbs. Various techniques for processing barley grain have been developed to decrease the degradability of dry matter in rumen without reducing its extent of digestion. McNiven (1995) showed roasting of barley is more effective treatment. The objective of this experiment was to study of effects the roasting and ammoniation of barley grain on rumen pH, feces pH, milk yield and milk composition in dairy cows.

The effect of hot season and nutrition on the oxidative status and metabolic profile in dairy goats during mid lactation

2006 ◽  
Vol 82 (5) ◽  
pp. 717-722 ◽  
Author(s):  
A. Di Trana ◽  
P. Celi ◽  
S. Claps ◽  
V. Fedele ◽  
R. Rubino
Keyword(s):  
Milk Yield ◽  
Metabolic Profile ◽  
Milk Composition ◽  
Oxidative Status ◽  
Reactive Oxygen Metabolites ◽  
Lactation Period ◽  
Dairy Goats ◽  
Natural Pasture ◽  
Lactating Goats ◽  
Hot Season

AbstractThe aim of this study was to evaluate the effects of the hot season and nutrition on the oxidative status and metabolic profile of lactating goats during mid lactation. Twenty-four Red Syrian goats were allocated into three groups that were offered the following diets: natural pasture (P), pasture+500 g/h per day of concentrate (PC) and hay plus 500 g/h per day of concentrate (HC). Blood samples were taken in spring (85±7 days in milk (DIM)) and summer (120±7 DIM) and assayed for reactive oxygen metabolites (ROMs), α-tocopherol, glucose, triglycerides, cholesterol, non-esterified fatty acids, total protein, albumin and globulin concentrations and glutathione peroxidase (GHS-Px) and superoxide dismutase (SOD) activities. Milk yield and milk composition were also measured. SOD, GSH-Px and ROMs levels increased during summer when temperature humidity index values were high. The increase in ROMs in the PC and HC groups could be ascribed to the improved nutritional regime and to their higher production level. The markers of the oxidative status and of the metabolic profile measured in this study indicate that goats may have experienced moderate oxidative stress. It seems that, seasonal rather than nutritional factors have a more pronounced effect on oxidative status markers. Concentrate supplementation sustained milk yield and may represent a useful means to extend the lactation period in dairy goats during late spring and summer.

Effect of bromelain on milk yield, milk composition and mammary health in dairy goats

2008 ◽  
Vol 41 (4) ◽  
pp. 493-498 ◽  
Author(s):  
A. Contreras ◽  
M. J. Paape ◽  
R. H. Miller ◽  
J. C. Corrales ◽  
C. Luengo ◽  
...  
Keyword(s):  
Milk Yield ◽  
Milk Composition ◽  
Dairy Goats
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